diff --git a/shared/static/scripts/htmx.min.js b/shared/static/scripts/htmx.min.js
new file mode 100644
index 00000000..59937d71
--- /dev/null
+++ b/shared/static/scripts/htmx.min.js
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/spec/tests/test-cek-try-seq.sx b/spec/tests/test-cek-try-seq.sx
new file mode 100644
index 00000000..5d969606
--- /dev/null
+++ b/spec/tests/test-cek-try-seq.sx
@@ -0,0 +1,64 @@
+;; Tests for cek-try sequential execution
+;; Bug: hydrate-island fallback leaves hydrating? scope active
+
+(defsuite
+  "cek-try-sequential"
+  (deftest
+    "code after cek-try runs on success"
+    (let
+      ((result (list)))
+      (append! result "before")
+      (cek-try (fn () (append! result "body") 42) (fn (e) nil))
+      (append! result "after")
+      (assert= 3 (len result))
+      (assert= "after" (nth result 2))))
+  (deftest
+    "code after cek-try runs on error"
+    (let
+      ((result (list)))
+      (append! result "before")
+      (cek-try (fn () (error "boom")) (fn (e) (append! result "caught")))
+      (append! result "after")
+      (assert= 3 (len result))
+      (assert= "after" (nth result 2))))
+  (deftest
+    "error in error handler propagates — skips post-try code"
+    (let
+      ((result (list)))
+      (append! result "before")
+      (guard
+        (outer-err (true (append! result "outer-caught")))
+        (cek-try (fn () (error "boom")) (fn (e) (error "handler-boom")))
+        (append! result "after-try"))
+      (assert-true (contains? result "before"))
+      (assert-true (contains? result "outer-caught"))
+      (assert= false (contains? result "after-try"))))
+  (deftest
+    "scope-pop after cek-try executes on error"
+    (scope-push! "test-scope" "value")
+    (cek-try (fn () (error "boom")) (fn (e) nil))
+    (scope-pop! "test-scope")
+    (assert= nil (scope-peek "test-scope")))
+  (deftest
+    "scope-push/pop balanced across cek-try error"
+    (let
+      ((result nil))
+      (scope-push! "bal-test" "pushed")
+      (cek-try (fn () (error "fail")) (fn (e) nil))
+      (set! result (scope-peek "bal-test"))
+      (scope-pop! "bal-test")
+      (assert= "pushed" result)
+      (assert= nil (scope-peek "bal-test"))))
+  (deftest
+    "error handler that errors skips cleanup"
+    (let
+      ((cleaned false))
+      (scope-push! "cleanup-test" "val")
+      (guard
+        (e (true nil))
+        (cek-try (fn () (error "first")) (fn (e) (error "second")))
+        (scope-pop! "cleanup-test")
+        (set! cleaned true))
+      (assert= false cleaned)
+      (assert= "val" (scope-peek "cleanup-test"))
+      (scope-pop! "cleanup-test"))))
\ No newline at end of file
diff --git a/spec/tests/test-hs-diag.sx b/spec/tests/test-hs-diag.sx
new file mode 100644
index 00000000..e1ec1316
--- /dev/null
+++ b/spec/tests/test-hs-diag.sx
@@ -0,0 +1,17 @@
+(defsuite
+  "hs-diag"
+  (deftest
+    "put into #id compiled"
+    (let
+      ((sx (hs-to-sx-from-source "on click put \"foo\" into #d1")))
+      (assert= (serialize sx) "SHOW")))
+  (deftest
+    "put into #id works"
+    (let
+      ((el (dom-create-element "div")))
+      (dom-set-attr el "id" "d1")
+      (dom-set-attr el "_" "on click put \"foo\" into #d1")
+      (dom-append (dom-body) el)
+      (hs-activate! el)
+      (dom-dispatch el "click" nil)
+      (assert= (dom-text-content el) "foo"))))
\ No newline at end of file
diff --git a/spec/tests/test-htmx.sx b/spec/tests/test-htmx.sx
new file mode 100644
index 00000000..44326fa8
--- /dev/null
+++ b/spec/tests/test-htmx.sx
@@ -0,0 +1,292 @@
+;; test-htmx.sx — Tests for htmx 4.0 compatibility layer
+;;
+;; Tests the attribute-to-handler translator: pure parsing functions,
+;; swap mode resolution, trigger parsing, and DOM integration via harness.
+
+;; ── Time parsing ────────────────────────────────────────────────
+
+(defsuite
+  "htmx-parse-time"
+  (deftest "parses milliseconds" (assert= (hx-parse-time "500ms") 500))
+  (deftest "parses seconds" (assert= (hx-parse-time "1s") 1000))
+  (deftest "parses fractional seconds" (assert= (hx-parse-time "0.5s") 500))
+  (deftest "parses minutes" (assert= (hx-parse-time "2m") 120000))
+  (deftest "parses bare number" (assert= (hx-parse-time "100") 100))
+  (deftest "returns nil for nil" (assert= (hx-parse-time nil) nil)))
+
+;; ── Swap mode normalization (v4 aliases) ────────────────────────
+
+(defsuite
+  "htmx-swap-aliases"
+  (deftest
+    "before → beforebegin"
+    (assert= (hx-normalize-swap-mode "before") "beforebegin"))
+  (deftest
+    "after → afterend"
+    (assert= (hx-normalize-swap-mode "after") "afterend"))
+  (deftest
+    "prepend → afterbegin"
+    (assert= (hx-normalize-swap-mode "prepend") "afterbegin"))
+  (deftest
+    "append → beforeend"
+    (assert= (hx-normalize-swap-mode "append") "beforeend"))
+  (deftest
+    "innerHTML passes through"
+    (assert= (hx-normalize-swap-mode "innerHTML") "innerHTML"))
+  (deftest
+    "outerHTML passes through"
+    (assert= (hx-normalize-swap-mode "outerHTML") "outerHTML"))
+  (deftest
+    "delete passes through"
+    (assert= (hx-normalize-swap-mode "delete") "delete"))
+  (deftest
+    "innerMorph passes through"
+    (assert= (hx-normalize-swap-mode "innerMorph") "innerMorph"))
+  (deftest
+    "outerMorph passes through"
+    (assert= (hx-normalize-swap-mode "outerMorph") "outerMorph"))
+  (deftest
+    "textContent passes through"
+    (assert= (hx-normalize-swap-mode "textContent") "textContent")))
+
+;; ── Swap spec parsing ───────────────────────────────────────────
+
+(defsuite
+  "htmx-parse-swap-spec"
+  (deftest
+    "nil defaults to innerHTML"
+    (let
+      ((spec (hx-parse-swap-spec nil)))
+      (assert= (get spec :mode) "innerHTML")))
+  (deftest
+    "bare mode"
+    (let
+      ((spec (hx-parse-swap-spec "outerHTML")))
+      (assert= (get spec :mode) "outerHTML")
+      (assert= (get spec :swap-delay) nil)))
+  (deftest
+    "mode with swap delay"
+    (let
+      ((spec (hx-parse-swap-spec "innerHTML swap:100ms")))
+      (assert= (get spec :mode) "innerHTML")
+      (assert= (get spec :swap-delay) 100)))
+  (deftest
+    "mode with settle delay"
+    (let
+      ((spec (hx-parse-swap-spec "innerHTML settle:200ms")))
+      (assert= (get spec :settle-delay) 200)))
+  (deftest
+    "mode with scroll"
+    (let
+      ((spec (hx-parse-swap-spec "innerHTML scroll:top")))
+      (assert= (get spec :scroll) "top")))
+  (deftest
+    "v4 alias normalized in spec"
+    (let
+      ((spec (hx-parse-swap-spec "append settle:500ms")))
+      (assert= (get spec :mode) "beforeend")
+      (assert= (get spec :settle-delay) 500)))
+  (deftest
+    "full spec with multiple modifiers"
+    (let
+      ((spec (hx-parse-swap-spec "innerHTML swap:50ms settle:100ms scroll:top")))
+      (assert= (get spec :mode) "innerHTML")
+      (assert= (get spec :swap-delay) 50)
+      (assert= (get spec :settle-delay) 100)
+      (assert= (get spec :scroll) "top"))))
+
+;; ── Trigger parsing ─────────────────────────────────────────────
+
+(defsuite
+  "htmx-parse-trigger"
+  (deftest
+    "simple event"
+    (let
+      ((spec (hx-parse-trigger "click" nil)))
+      (assert= (get spec :event) "click")
+      (assert= (get spec :delay) nil)
+      (assert= (get spec :once) false)))
+  (deftest
+    "event with delay"
+    (let
+      ((spec (hx-parse-trigger "keyup delay:500ms" nil)))
+      (assert= (get spec :event) "keyup")
+      (assert= (get spec :delay) 500)))
+  (deftest
+    "event with throttle"
+    (let
+      ((spec (hx-parse-trigger "click throttle:1s" nil)))
+      (assert= (get spec :event) "click")
+      (assert= (get spec :throttle) 1000)))
+  (deftest
+    "event with once"
+    (let
+      ((spec (hx-parse-trigger "click once" nil)))
+      (assert= (get spec :event) "click")
+      (assert= (get spec :once) true)))
+  (deftest
+    "event with changed"
+    (let
+      ((spec (hx-parse-trigger "keyup changed delay:500ms" nil)))
+      (assert= (get spec :event) "keyup")
+      (assert= (get spec :changed) true)
+      (assert= (get spec :delay) 500)))
+  (deftest
+    "event with from selector"
+    (let
+      ((spec (hx-parse-trigger "click from:body" nil)))
+      (assert= (get spec :event) "click")
+      (assert= (get spec :from) "body")))
+  (deftest
+    "event with filter"
+    (let
+      ((spec (hx-parse-trigger "keyup [key=='Enter']" nil)))
+      (assert= (get spec :event) "keyup")
+      (assert= (get spec :filter) "[key=='Enter']")))
+  (deftest
+    "every trigger"
+    (let
+      ((spec (hx-parse-trigger "every delay:2s" nil)))
+      (assert= (get spec :event) "every")
+      (assert= (get spec :delay) 2000))))
+
+;; ── URL encoding ────────────────────────────────────────────────
+
+(defsuite
+  "htmx-url-encode"
+  (deftest
+    "encodes single param"
+    (assert= (url-encode-params {:q "search"}) "q=search"))
+  (deftest
+    "encodes numeric values"
+    (assert= (url-encode-params {:page 1}) "page=1")))
+
+(defsuite
+  "htmx-status-matches"
+  (deftest "exact match" (assert= (hx-status-matches? "404" "404") true))
+  (deftest
+    "exact non-match"
+    (assert= (hx-status-matches? "404" "500") false))
+  (deftest
+    "1-digit wildcard 5xx matches 503"
+    (assert= (hx-status-matches? "503" "5xx") true))
+  (deftest
+    "1-digit wildcard 4xx does not match 503"
+    (assert= (hx-status-matches? "503" "4xx") false))
+  (deftest
+    "2-digit wildcard 50x matches 503"
+    (assert= (hx-status-matches? "503" "50x") true))
+  (deftest
+    "2-digit wildcard 50x does not match 522"
+    (assert= (hx-status-matches? "522" "50x") false))
+  (deftest "2xx matches 200" (assert= (hx-status-matches? "200" "2xx") true)))
+
+(defsuite
+  "htmx-status-modifiers"
+  (deftest
+    "parses swap target push"
+    (let
+      ((m (hx-parse-status-modifiers "swap:innerHTML target:#errors push:false")))
+      (assert= (get m :swap) "innerHTML")
+      (assert= (get m :target) "#errors")
+      (assert= (get m :push) "false")))
+  (deftest
+    "parses transition"
+    (let
+      ((m (hx-parse-status-modifiers "swap:none transition:true")))
+      (assert= (get m :swap) "none")
+      (assert= (get m :transition) "true"))))
+
+(defsuite
+  "htmx-match-status"
+  (deftest
+    "exact match wins over wildcard"
+    (let
+      ((rules (list {:target nil :transition nil :swap "none" :select nil :push nil :specificity 1 :code "5xx" :replace nil} {:target nil :transition nil :swap "outerHTML" :select nil :push nil :specificity 3 :code "503" :replace nil})))
+      (assert= (get (hx-match-status 503 rules) :swap) "outerHTML")))
+  (deftest
+    "2-digit wildcard wins over 1-digit"
+    (let
+      ((rules (list {:target nil :transition nil :swap "none" :select nil :push nil :specificity 1 :code "5xx" :replace nil} {:target nil :transition nil :swap "innerHTML" :select nil :push nil :specificity 2 :code "50x" :replace nil})))
+      (assert= (get (hx-match-status 501 rules) :swap) "innerHTML")))
+  (deftest
+    "nil when no match"
+    (let
+      ((rules (list {:target nil :transition nil :swap "none" :select nil :push nil :specificity 1 :code "5xx" :replace nil})))
+      (assert= (hx-match-status 404 rules) nil))))
+
+(defsuite
+  "htmx-sync-spec"
+  (deftest
+    "parses selector:strategy"
+    (let
+      ((s (hx-parse-sync-spec "closest form:abort")))
+      (assert= (get s :selector) "closest form")
+      (assert= (get s :strategy) "abort")))
+  (deftest
+    "parses queue with mode"
+    (let
+      ((s (hx-parse-sync-spec "this:queue last")))
+      (assert= (get s :selector) "this")
+      (assert= (get s :strategy) "queue")
+      (assert= (get s :queue-mode) "last")))
+  (deftest
+    "defaults to drop strategy"
+    (let
+      ((s (hx-parse-sync-spec "this:drop")))
+      (assert= (get s :strategy) "drop")))
+  (deftest "nil for nil input" (assert= (hx-parse-sync-spec nil) nil)))
+
+(defsuite
+  "htmx-sse-swap-parse"
+  (deftest
+    "parses single spec"
+    (let
+      ((specs (hx-parse-sse-swap "message:#target")))
+      (assert= (len specs) 1)
+      (assert= (get (first specs) :event) "message")
+      (assert= (get (first specs) :target) "#target")))
+  (deftest
+    "parses multiple specs with swap mode"
+    (let
+      ((specs (hx-parse-sse-swap "message:#target,update:#list:outerHTML")))
+      (assert= (len specs) 2)
+      (assert= (get (nth specs 1) :event) "update")
+      (assert= (get (nth specs 1) :swap) "outerHTML")))
+  (deftest
+    "nil returns empty list"
+    (assert= (hx-parse-sse-swap nil) (list))))
+
+(defsuite
+  "htmx-swap-spec-v4-modifiers"
+  (deftest
+    "transition modifier"
+    (let
+      ((spec (hx-parse-swap-spec "innerHTML transition:true")))
+      (assert= (get spec :transition) true)
+      (assert= (get spec :mode) "innerHTML")))
+  (deftest
+    "strip modifier"
+    (let
+      ((spec (hx-parse-swap-spec "outerHTML strip:true")))
+      (assert= (get spec :strip) true)))
+  (deftest
+    "target override in swap spec"
+    (let
+      ((spec (hx-parse-swap-spec "innerHTML target:#alt")))
+      (assert= (get spec :target) "#alt")))
+  (deftest
+    "ignoreTitle modifier"
+    (let
+      ((spec (hx-parse-swap-spec "innerHTML ignoreTitle:true")))
+      (assert= (get spec :ignore-title) true)))
+  (deftest
+    "all modifiers together"
+    (let
+      ((spec (hx-parse-swap-spec "append swap:50ms settle:100ms scroll:top transition:true strip:true")))
+      (assert= (get spec :mode) "beforeend")
+      (assert= (get spec :swap-delay) 50)
+      (assert= (get spec :settle-delay) 100)
+      (assert= (get spec :scroll) "top")
+      (assert= (get spec :transition) true)
+      (assert= (get spec :strip) true))))
\ No newline at end of file
diff --git a/spec/tests/test-perform-chain.sx b/spec/tests/test-perform-chain.sx
new file mode 100644
index 00000000..3cb4a075
--- /dev/null
+++ b/spec/tests/test-perform-chain.sx
@@ -0,0 +1,63 @@
+;; Tests for perform/IO suspension chaining through for-each
+;; Bug: after resume from first perform inside for-each,
+;; subsequent iterations' performs don't suspend — they complete
+;; synchronously, breaking multi-step async sequences like test runners.
+
+(defsuite
+  "perform-for-each-chain"
+  (deftest
+    "for-each with perform suspends on each iteration"
+    (let
+      ((state1 (cek-step-loop (make-cek-state (quote (let ((results (list))) (for-each (fn (item) (let ((val (perform {:op "fetch" :key item}))) (append! results val))) (list "a" "b" "c")) results)) (make-env) (list)))))
+      (assert-true (cek-suspended? state1))
+      (assert= "a" (get (cek-io-request state1) :key))
+      (let
+        ((state2 (cek-resume state1 "result-a")))
+        (assert-true (cek-suspended? state2))
+        (assert= "b" (get (cek-io-request state2) :key))
+        (let
+          ((state3 (cek-resume state2 "result-b")))
+          (assert-true (cek-suspended? state3))
+          (assert= "c" (get (cek-io-request state3) :key))
+          (let
+            ((final (cek-resume state3 "result-c")))
+            (assert-true (cek-terminal? final))
+            (assert= 3 (len (cek-value final))))))))
+  (deftest
+    "for-each with guard and perform chains correctly"
+    (let
+      ((state1 (cek-step-loop (make-cek-state (quote (let ((results (list))) (for-each (fn (item) (guard (e (true (append! results (str "fail:" item)))) (let ((val (perform {:op "fetch" :key item}))) (append! results (str "ok:" val))))) (list "x" "y")) results)) (make-env) (list)))))
+      (assert-true (cek-suspended? state1))
+      (let
+        ((state2 (cek-resume state1 "X")))
+        (assert-true (cek-suspended? state2))
+        (let
+          ((final (cek-resume state2 "Y")))
+          (assert-true (cek-terminal? final))
+          (let
+            ((results (cek-value final)))
+            (assert= 2 (len results))
+            (assert= "ok:X" (nth results 0))
+            (assert= "ok:Y" (nth results 1)))))))
+  (deftest
+    "nested performs in for-each — reload + wait pattern"
+    (let
+      ((state1 (cek-step-loop (make-cek-state (quote (let ((log (list))) (for-each (fn (name) (perform {:op "wait" :ms 1000}) (append! log (str "reloaded:" name)) (perform {:op "wait" :ms 500}) (append! log (str "done:" name))) (list "t1" "t2")) log)) (make-env) (list)))))
+      (assert-true (cek-suspended? state1))
+      (assert= 1000 (get (cek-io-request state1) :ms))
+      (let
+        ((s2 (cek-resume state1 nil)))
+        (assert-true (cek-suspended? s2))
+        (assert= 500 (get (cek-io-request s2) :ms))
+        (let
+          ((s3 (cek-resume s2 nil)))
+          (assert-true (cek-suspended? s3))
+          (assert= 1000 (get (cek-io-request s3) :ms))
+          (let
+            ((s4 (cek-resume s3 nil)))
+            (assert-true (cek-suspended? s4))
+            (assert= 500 (get (cek-io-request s4) :ms))
+            (let
+              ((final (cek-resume s4 nil)))
+              (assert-true (cek-terminal? final))
+              (assert= 4 (len (cek-value final))))))))))
\ No newline at end of file
diff --git a/tests/hs-behavioral-node.js b/tests/hs-behavioral-node.js
new file mode 100644
index 00000000..d16303f5
--- /dev/null
+++ b/tests/hs-behavioral-node.js
@@ -0,0 +1,448 @@
+#!/usr/bin/env node
+/**
+ * Run hyperscript behavioral tests in Node.js using the WASM kernel.
+ * No browser needed — uses a minimal DOM mock.
+ */
+const fs = require('fs');
+const path = require('path');
+
+const PROJECT = path.resolve(__dirname, '..');
+const WASM_DIR = path.join(PROJECT, 'shared/static/wasm');
+const SX_DIR = path.join(WASM_DIR, 'sx');
+
+// Load WASM kernel
+eval(fs.readFileSync(path.join(WASM_DIR, 'sx_browser.bc.js'), 'utf8'));
+const K = globalThis.SxKernel;
+
+// ─── Minimal DOM mock ───────────────────────────────────────────
+class MockElement {
+  constructor(tag) {
+    this.tagName = tag.toUpperCase();
+    this.nodeName = this.tagName;
+    this.nodeType = 1;
+    this.id = '';
+    this.className = '';
+    this.classList = new MockClassList(this);
+    this.style = {};
+    this.attributes = {};
+    this.children = [];
+    this.childNodes = [];
+    this.parentElement = null;
+    this.parentNode = null;
+    this.textContent = '';
+    this.innerHTML = '';
+    this.outerHTML = '';
+    this._listeners = {};
+    this._hs = {};  // hyperscript data
+    this.dataset = {};
+    this.open = false; // for dialog
+  }
+  setAttribute(name, val) { this.attributes[name] = val; if (name === 'id') this.id = val; if (name === 'class') { this.className = val; this.classList._sync(val); } }
+  getAttribute(name) { return this.attributes[name] !== undefined ? this.attributes[name] : null; }
+  removeAttribute(name) { delete this.attributes[name]; }
+  hasAttribute(name) { return name in this.attributes; }
+  addEventListener(evt, fn, opts) {
+    if (!this._listeners[evt]) this._listeners[evt] = [];
+    this._listeners[evt].push(fn);
+  }
+  removeEventListener(evt, fn) {
+    if (this._listeners[evt]) this._listeners[evt] = this._listeners[evt].filter(f => f !== fn);
+  }
+  dispatchEvent(event) {
+    event.target = this;
+    event.currentTarget = this;
+    const fns = this._listeners[event.type] || [];
+    for (const fn of fns) {
+      try { fn(event); } catch(e) {}
+    }
+    // Bubble
+    if (event.bubbles && !event._stopped && this.parentElement) {
+      event.currentTarget = this.parentElement;
+      this.parentElement.dispatchEvent(event);
+    }
+    return !event.defaultPrevented;
+  }
+  appendChild(child) {
+    if (child.parentElement) child.parentElement.removeChild(child);
+    child.parentElement = this;
+    child.parentNode = this;
+    this.children.push(child);
+    this.childNodes.push(child);
+    return child;
+  }
+  removeChild(child) {
+    this.children = this.children.filter(c => c !== child);
+    this.childNodes = this.childNodes.filter(c => c !== child);
+    child.parentElement = null;
+    child.parentNode = null;
+    return child;
+  }
+  insertBefore(newChild, refChild) {
+    const idx = this.children.indexOf(refChild);
+    if (idx >= 0) { this.children.splice(idx, 0, newChild); this.childNodes.splice(idx, 0, newChild); }
+    else { this.children.push(newChild); this.childNodes.push(newChild); }
+    newChild.parentElement = this;
+    newChild.parentNode = this;
+    return newChild;
+  }
+  replaceChild(newChild, oldChild) {
+    const idx = this.children.indexOf(oldChild);
+    if (idx >= 0) { this.children[idx] = newChild; this.childNodes[idx] = newChild; }
+    newChild.parentElement = this;
+    newChild.parentNode = this;
+    oldChild.parentElement = null;
+    oldChild.parentNode = null;
+    return oldChild;
+  }
+  querySelector(sel) { return findInTree(this, sel); }
+  querySelectorAll(sel) { return findAllInTree(this, sel); }
+  closest(sel) {
+    let el = this;
+    while (el) { if (matchesSelector(el, sel)) return el; el = el.parentElement; }
+    return null;
+  }
+  matches(sel) { return matchesSelector(this, sel); }
+  contains(other) {
+    if (other === this) return true;
+    for (const c of this.children) { if (c === other || c.contains(other)) return true; }
+    return false;
+  }
+  cloneNode(deep) {
+    const el = new MockElement(this.tagName.toLowerCase());
+    Object.assign(el.attributes, this.attributes);
+    el.id = this.id;
+    el.className = this.className;
+    el.classList._sync(this.className);
+    Object.assign(el.style, this.style);
+    el.textContent = this.textContent;
+    el.innerHTML = this.innerHTML;
+    if (deep) { for (const c of this.children) el.appendChild(c.cloneNode(true)); }
+    return el;
+  }
+  focus() {}
+  blur() {}
+  click() { this.dispatchEvent(new MockEvent('click', { bubbles: true })); }
+  remove() { if (this.parentElement) this.parentElement.removeChild(this); }
+  get firstElementChild() { return this.children[0] || null; }
+  get lastElementChild() { return this.children[this.children.length - 1] || null; }
+  get nextElementSibling() {
+    if (!this.parentElement) return null;
+    const idx = this.parentElement.children.indexOf(this);
+    return this.parentElement.children[idx + 1] || null;
+  }
+  get previousElementSibling() {
+    if (!this.parentElement) return null;
+    const idx = this.parentElement.children.indexOf(this);
+    return idx > 0 ? this.parentElement.children[idx - 1] : null;
+  }
+  // Dialog methods
+  showModal() { this.open = true; this.setAttribute('open', ''); }
+  show() { this.open = true; this.setAttribute('open', ''); }
+  close() { this.open = false; this.removeAttribute('open'); }
+  // Transition stub
+  getAnimations() { return []; }
+  getBoundingClientRect() { return { top: 0, left: 0, width: 100, height: 100, right: 100, bottom: 100 }; }
+  scrollIntoView() {}
+}
+
+class MockClassList {
+  constructor(el) { this._el = el; this._set = new Set(); }
+  _sync(str) { this._set = new Set((str || '').split(/\s+/).filter(Boolean)); }
+  add(...cls) { for (const c of cls) this._set.add(c); this._el.className = [...this._set].join(' '); }
+  remove(...cls) { for (const c of cls) this._set.delete(c); this._el.className = [...this._set].join(' '); }
+  toggle(cls, force) {
+    if (force !== undefined) { if (force) this.add(cls); else this.remove(cls); return force; }
+    if (this._set.has(cls)) { this.remove(cls); return false; }
+    else { this.add(cls); return true; }
+  }
+  contains(cls) { return this._set.has(cls); }
+  get length() { return this._set.size; }
+  [Symbol.iterator]() { return this._set[Symbol.iterator](); }
+}
+
+class MockEvent {
+  constructor(type, opts = {}) {
+    this.type = type;
+    this.bubbles = opts.bubbles || false;
+    this.cancelable = opts.cancelable !== false;
+    this.defaultPrevented = false;
+    this._stopped = false;
+    this._stoppedImmediate = false;
+    this.target = null;
+    this.currentTarget = null;
+    this.detail = opts.detail || null;
+  }
+  preventDefault() { this.defaultPrevented = true; }
+  stopPropagation() { this._stopped = true; }
+  stopImmediatePropagation() { this._stopped = true; this._stoppedImmediate = true; }
+}
+
+class MockCustomEvent extends MockEvent {
+  constructor(type, opts = {}) { super(type, opts); this.detail = opts.detail || null; }
+}
+
+function matchesSelector(el, sel) {
+  if (!el || !el.tagName) return false;
+  if (sel.startsWith('#')) return el.id === sel.slice(1);
+  if (sel.startsWith('.')) return el.classList.contains(sel.slice(1));
+  if (sel.includes('#')) { const [tag, id] = sel.split('#'); return el.tagName.toLowerCase() === tag && el.id === id; }
+  return el.tagName.toLowerCase() === sel.toLowerCase();
+}
+
+function findInTree(el, sel) {
+  for (const c of (el.children || [])) {
+    if (matchesSelector(c, sel)) return c;
+    const found = findInTree(c, sel);
+    if (found) return found;
+  }
+  return null;
+}
+
+function findAllInTree(el, sel) {
+  const results = [];
+  for (const c of (el.children || [])) {
+    if (matchesSelector(c, sel)) results.push(c);
+    results.push(...findAllInTree(c, sel));
+  }
+  return results;
+}
+
+// ─── Global DOM mock ────────────────────────────────────────────
+const _body = new MockElement('body');
+const _html = new MockElement('html');
+_html.appendChild(_body);
+
+const document = {
+  body: _body,
+  documentElement: _html,
+  createElement(tag) { return new MockElement(tag); },
+  createElementNS(ns, tag) { return new MockElement(tag); },
+  createDocumentFragment() { return new MockElement('fragment'); },
+  createTextNode(text) { const t = { nodeType: 3, textContent: text, data: text }; return t; },
+  getElementById(id) { return findInTree(_body, '#' + id); },
+  querySelector(sel) { return findInTree(_body, sel); },
+  querySelectorAll(sel) { return findAllInTree(_body, sel); },
+  createEvent(type) { return new MockEvent(type); },
+  addEventListener() {},
+  removeEventListener() {},
+};
+
+globalThis.document = document;
+globalThis.window = globalThis;
+globalThis.HTMLElement = MockElement;
+globalThis.Element = MockElement;
+globalThis.Event = MockEvent;
+globalThis.CustomEvent = MockCustomEvent;
+globalThis.NodeList = Array;
+globalThis.HTMLCollection = Array;
+globalThis.getComputedStyle = (el) => el.style;
+globalThis.requestAnimationFrame = (fn) => setTimeout(fn, 0);
+globalThis.cancelAnimationFrame = (id) => clearTimeout(id);
+globalThis.MutationObserver = class { observe() {} disconnect() {} };
+globalThis.ResizeObserver = class { observe() {} disconnect() {} };
+globalThis.IntersectionObserver = class { observe() {} disconnect() {} };
+globalThis.navigator = { userAgent: 'node-test' };
+globalThis.location = { href: 'http://localhost/', pathname: '/', search: '', hash: '' };
+globalThis.history = { pushState() {}, replaceState() {}, back() {}, forward() {} };
+
+// ─── Host FFI ───────────────────────────────────────────────────
+K.registerNative('host-global', a => { const n = a[0]; return (n in globalThis) ? globalThis[n] : null; });
+K.registerNative('host-get', a => { if (a[0] == null) return null; const v = a[0][a[1]]; return v === undefined ? null : v; });
+K.registerNative('host-set!', a => { if (a[0] != null) a[0][a[1]] = a[2]; return a[2]; });
+K.registerNative('host-call', a => {
+  const [o, m, ...r] = a;
+  if (o == null) { const f = globalThis[m]; return typeof f === 'function' ? f.apply(null, r) : null; }
+  if (typeof o[m] !== 'function') return null;
+  try { const v = o[m].apply(o, r); return v === undefined ? null : v; } catch(e) { return null; }
+});
+K.registerNative('host-new', a => {
+  const C = typeof a[0] === 'string' ? globalThis[a[0]] : a[0];
+  return typeof C === 'function' ? new C(...a.slice(1)) : null;
+});
+K.registerNative('host-callback', a => {
+  const fn = a[0];
+  if (typeof fn === 'function' && fn.__sx_handle === undefined) return fn;
+  if (fn && fn.__sx_handle !== undefined) {
+    return function() {
+      const r = K.callFn(fn, Array.from(arguments));
+      if (globalThis._driveAsync) globalThis._driveAsync(r);
+      return r;
+    };
+  }
+  return function() {};
+});
+K.registerNative('host-typeof', a => {
+  const o = a[0]; if (o == null) return 'nil';
+  if (o instanceof MockElement) return 'element';
+  if (o && o.nodeType === 3) return 'text';
+  if (o instanceof MockEvent || o instanceof MockCustomEvent) return 'event';
+  if (o instanceof Promise) return 'promise';
+  return typeof o;
+});
+K.registerNative('host-await', a => {
+  const [p, cb] = a;
+  if (p && typeof p.then === 'function') {
+    const f = (cb && cb.__sx_handle !== undefined) ? v => K.callFn(cb, [v]) : () => {};
+    p.then(f);
+  }
+});
+K.registerNative('load-library!', () => false);
+
+// Drive async suspension — synchronous, with depth limit
+globalThis._driveAsync = function driveAsync(result, depth) {
+  depth = depth || 0;
+  if (depth > 200) return; // prevent infinite loops
+  if (!result || !result.suspended) return;
+  const req = result.request;
+  const items = req && (req.items || req);
+  const op = items && items[0];
+  const opName = typeof op === 'string' ? op : (op && op.name) || String(op);
+  const arg = items && items[1];
+  function doResume(val) {
+    try { const r = result.resume(val); driveAsync(r, depth + 1); } catch(e) {}
+  }
+  if (opName === 'io-sleep' || opName === 'wait') doResume(null);
+  else if (opName === 'io-fetch') doResume({ ok: true, text: '' });
+  else if (opName === 'io-settle') doResume(null);
+  else if (opName === 'io-wait-event') doResume(null);
+  else if (opName === 'io-transition') doResume(null);
+};
+
+K.eval('(define SX_VERSION "hs-test-1.0")');
+K.eval('(define SX_ENGINE "ocaml-vm-sandbox")');
+K.eval('(define parse sx-parse)');
+K.eval('(define serialize sx-serialize)');
+
+// ─── Load modules ───────────────────────────────────────────────
+const WEB_MODULES = [
+  'render', 'core-signals', 'signals', 'deps', 'router',
+  'page-helpers', 'freeze', 'dom', 'browser',
+  'adapter-html', 'adapter-sx', 'adapter-dom',
+  'boot-helpers', 'hypersx', 'engine', 'orchestration', 'boot',
+];
+const HS_MODULES = ['hs-tokenizer', 'hs-parser', 'hs-compiler', 'hs-runtime', 'hs-integration'];
+
+K.beginModuleLoad();
+for (const mod of [...WEB_MODULES, ...HS_MODULES]) {
+  const sxPath = path.join(SX_DIR, mod + '.sx');
+  const libPath = path.join(PROJECT, 'lib/hyperscript', mod.replace(/^hs-/, '') + '.sx');
+  let src;
+  try { src = fs.existsSync(sxPath) ? fs.readFileSync(sxPath, 'utf8') : fs.readFileSync(libPath, 'utf8'); }
+  catch(e) { console.error(`SKIP: ${mod}`); continue; }
+  try { K.load(src); } catch(e) { console.error(`LOAD ERROR: ${mod}: ${e.message}`); }
+}
+K.endModuleLoad();
+
+// ─── Register tests ─────────────────────────────────────────────
+K.eval('(define _test-registry (list))');
+K.eval('(define _test-suite "")');
+K.eval('(define push-suite (fn (name) (set! _test-suite name)))');
+K.eval('(define pop-suite (fn () (set! _test-suite "")))');
+K.eval(`(define try-call (fn (thunk)
+  (set! _test-registry (append _test-registry (list {:suite _test-suite :thunk thunk})))
+  {:ok true}))`);
+K.eval(`(define report-pass (fn (name)
+  (let ((i (- (len _test-registry) 1)))
+    (when (>= i 0) (dict-set! (nth _test-registry i) "name" name)))))`);
+K.eval(`(define report-fail (fn (name error)
+  (let ((i (- (len _test-registry) 1)))
+    (when (>= i 0) (dict-set! (nth _test-registry i) "name" name)))))`);
+
+// Load test files
+for (const f of ['spec/harness.sx', 'spec/tests/test-framework.sx', 'spec/tests/test-hyperscript-behavioral.sx']) {
+  try { K.load(fs.readFileSync(path.join(PROJECT, f), 'utf8')); }
+  catch(e) { console.error(`LOAD ERROR: ${f}: ${e.message}`); }
+}
+
+// ─── Run tests ──────────────────────────────────────────────────
+const testCount = K.eval('(len _test-registry)');
+console.log(`Loaded ${testCount} tests`);
+
+let passed = 0, failed = 0;
+const cats = {};
+const errTypes = {};
+const failDetails = [];
+
+for (let i = 0; i < testCount; i++) {
+  const suite = K.eval(`(get (nth _test-registry ${i}) "suite")`) || '';
+  const name = K.eval(`(get (nth _test-registry ${i}) "name")`) || `test-${i}`;
+
+  // Reset body
+  _body.children = [];
+  _body.childNodes = [];
+  _body.innerHTML = '';
+
+  process.stderr.write(`  [${i}/${testCount}] ${suite} > ${name}\n`);
+
+  let ok = false;
+  let err = null;
+  try {
+    const thunk = K.eval(`(get (nth _test-registry ${i}) "thunk")`);
+    if (!thunk) { err = 'no thunk'; }
+    else {
+      const r = K.callFn(thunk, []);
+      if (r && r.suspended) globalThis._driveAsync(r);
+      ok = true;
+    }
+  } catch(e) {
+    err = (e.message || '').slice(0, 150);
+  }
+
+  if (!cats[suite]) cats[suite] = { p: 0, f: 0, errs: [] };
+  if (ok) {
+    passed++;
+    cats[suite].p++;
+  } else {
+    failed++;
+    cats[suite].f++;
+    cats[suite].errs.push({ name, err });
+
+    let t = 'other';
+    if (err === 'TIMEOUT') t = 'timeout';
+    else if (err && err.includes('NOT IMPLEMENTED')) t = 'stub';
+    else if (err && err.includes('Assertion')) t = 'assert-fail';
+    else if (err && err.includes('Expected')) t = 'wrong-value';
+    else if (err && err.includes('Undefined symbol')) t = 'undef-sym';
+    else if (err && err.includes('Unhandled')) t = 'unhandled';
+    errTypes[t] = (errTypes[t] || 0) + 1;
+  }
+}
+
+// ─── Report ─────────────────────────────────────────────────────
+console.log(`\nResults: ${passed}/${passed + failed} (${(100 * passed / (passed + failed)).toFixed(0)}%)\n`);
+
+console.log('By category:');
+for (const [cat, s] of Object.entries(cats).sort((a, b) => (b[1].p / (b[1].p + b[1].f)) - (a[1].p / (a[1].p + a[1].f)))) {
+  const mark = s.f === 0 ? `✓ ${s.p}` : `${s.p}/${s.p + s.f}`;
+  console.log(`  ${cat}: ${mark}`);
+}
+
+console.log('\nFailure types:');
+for (const [t, n] of Object.entries(errTypes).sort((a, b) => b[1] - a[1])) {
+  console.log(`  ${t}: ${n}`);
+}
+
+// Unique errors
+const uniqueErrors = {};
+for (const [cat, s] of Object.entries(cats)) {
+  for (const { name, err } of s.errs) {
+    const e = (err || '').slice(0, 100);
+    if (!uniqueErrors[e]) uniqueErrors[e] = 0;
+    uniqueErrors[e]++;
+  }
+}
+console.log(`\nUnique errors (${Object.keys(uniqueErrors).length}):`);
+for (const [e, n] of Object.entries(uniqueErrors).sort((a, b) => b[1] - a[1]).slice(0, 30)) {
+  console.log(`  [${n}x] ${e}`);
+}
+
+// Show per-category failures for categories with < 5 failures
+console.log('\nDetailed failures (categories with <10 fails):');
+for (const [cat, s] of Object.entries(cats).sort((a, b) => a[1].f - b[1].f)) {
+  if (s.f > 0 && s.f < 10) {
+    console.log(`  ${cat} (${s.p}/${s.p + s.f}):`);
+    for (const { name, err } of s.errs) {
+      console.log(`    FAIL: ${name}: ${(err || '').slice(0, 100)}`);
+    }
+  }
+}
diff --git a/tests/hs-behavioral-runner.js b/tests/hs-behavioral-runner.js
new file mode 100644
index 00000000..9b6e3014
--- /dev/null
+++ b/tests/hs-behavioral-runner.js
@@ -0,0 +1,222 @@
+#!/usr/bin/env node
+/**
+ * Run hyperscript behavioral tests in Node.js with per-test timeout via worker_threads.
+ */
+const { Worker, isMainThread, parentPort, workerData } = require('worker_threads');
+const fs = require('fs');
+const path = require('path');
+
+if (!isMainThread) {
+  // ─── Worker: run a single test ─────────────────────────────────
+  const { testIdx } = workerData;
+  const PROJECT = path.resolve(__dirname, '..');
+  const WASM_DIR = path.join(PROJECT, 'shared/static/wasm');
+  const SX_DIR = path.join(WASM_DIR, 'sx');
+
+  eval(fs.readFileSync(path.join(WASM_DIR, 'sx_browser.bc.js'), 'utf8'));
+  const K = globalThis.SxKernel;
+
+  // Minimal DOM mock
+  class El {
+    constructor(t) { this.tagName=t.toUpperCase(); this.nodeName=this.tagName; this.nodeType=1; this.id=''; this.className=''; this.classList=new CL(this); this.style={}; this.attributes={}; this.children=[]; this.childNodes=[]; this.parentElement=null; this.parentNode=null; this.textContent=''; this.innerHTML=''; this._listeners={}; this.dataset={}; this.open=false; }
+    setAttribute(n,v) { this.attributes[n]=v; if(n==='id')this.id=v; if(n==='class'){this.className=v;this.classList._s(v);} }
+    getAttribute(n) { return this.attributes[n]!==undefined?this.attributes[n]:null; }
+    removeAttribute(n) { delete this.attributes[n]; }
+    hasAttribute(n) { return n in this.attributes; }
+    addEventListener(e,f) { if(!this._listeners[e])this._listeners[e]=[]; this._listeners[e].push(f); }
+    removeEventListener(e,f) { if(this._listeners[e])this._listeners[e]=this._listeners[e].filter(x=>x!==f); }
+    dispatchEvent(ev) { ev.target=this; ev.currentTarget=this; for(const f of (this._listeners[ev.type]||[])){try{f(ev);}catch(e){}} if(ev.bubbles&&!ev._s&&this.parentElement){ev.currentTarget=this.parentElement;this.parentElement.dispatchEvent(ev);} return !ev.defaultPrevented; }
+    appendChild(c) { if(c.parentElement)c.parentElement.removeChild(c); c.parentElement=this; c.parentNode=this; this.children.push(c); this.childNodes.push(c); return c; }
+    removeChild(c) { this.children=this.children.filter(x=>x!==c); this.childNodes=this.childNodes.filter(x=>x!==c); c.parentElement=null; c.parentNode=null; return c; }
+    insertBefore(n,r) { const i=this.children.indexOf(r); if(i>=0){this.children.splice(i,0,n);this.childNodes.splice(i,0,n);}else{this.children.push(n);this.childNodes.push(n);} n.parentElement=this;n.parentNode=this; return n; }
+    replaceChild(n,o) { const i=this.children.indexOf(o); if(i>=0){this.children[i]=n;this.childNodes[i]=n;} n.parentElement=this;n.parentNode=this; o.parentElement=null;o.parentNode=null; return o; }
+    querySelector(s) { return fnd(this,s); }
+    querySelectorAll(s) { return fndAll(this,s); }
+    closest(s) { let e=this; while(e){if(mt(e,s))return e; e=e.parentElement;} return null; }
+    matches(s) { return mt(this,s); }
+    contains(o) { if(o===this)return true; for(const c of this.children)if(c===o||c.contains(o))return true; return false; }
+    cloneNode(d) { const e=new El(this.tagName.toLowerCase()); Object.assign(e.attributes,this.attributes); e.id=this.id; e.className=this.className; e.classList._s(this.className); Object.assign(e.style,this.style); e.textContent=this.textContent; e.innerHTML=this.innerHTML; if(d)for(const c of this.children)e.appendChild(c.cloneNode(true)); return e; }
+    focus(){} blur(){} click(){ this.dispatchEvent(new Ev('click',{bubbles:true})); } remove(){ if(this.parentElement)this.parentElement.removeChild(this); }
+    get firstElementChild() { return this.children[0]||null; }
+    get lastElementChild() { return this.children[this.children.length-1]||null; }
+    get nextElementSibling() { if(!this.parentElement)return null; const i=this.parentElement.children.indexOf(this); return this.parentElement.children[i+1]||null; }
+    get previousElementSibling() { if(!this.parentElement)return null; const i=this.parentElement.children.indexOf(this); return i>0?this.parentElement.children[i-1]:null; }
+    showModal(){this.open=true;this.setAttribute('open','');} show(){this.open=true;} close(){this.open=false;this.removeAttribute('open');}
+    getAnimations(){return [];} getBoundingClientRect(){return{top:0,left:0,width:100,height:100};} scrollIntoView(){}
+  }
+  class CL { constructor(e){this._e=e;this._s=new Set();} _s(str){this._s=new Set((str||'').split(/\s+/).filter(Boolean));} add(...c){for(const x of c)this._s.add(x);this._e.className=[...this._s].join(' ');} remove(...c){for(const x of c)this._s.delete(x);this._e.className=[...this._s].join(' ');} toggle(c,f){if(f!==undefined){if(f)this.add(c);else this.remove(c);return f;} if(this._s.has(c)){this.remove(c);return false;}else{this.add(c);return true;}} contains(c){return this._s.has(c);} get length(){return this._s.size;} }
+  class Ev { constructor(t,o={}){this.type=t;this.bubbles=o.bubbles||false;this.cancelable=o.cancelable!==false;this.defaultPrevented=false;this._s=false;this.target=null;this.currentTarget=null;this.detail=o.detail||null;} preventDefault(){this.defaultPrevented=true;} stopPropagation(){this._s=true;} stopImmediatePropagation(){this._s=true;} }
+  function mt(e,s){if(!e||!e.tagName)return false;if(s.startsWith('#'))return e.id===s.slice(1);if(s.startsWith('.'))return e.classList.contains(s.slice(1));if(s.includes('#')){const[t,i]=s.split('#');return e.tagName.toLowerCase()===t&&e.id===i;} return e.tagName.toLowerCase()===s.toLowerCase();}
+  function fnd(e,s){for(const c of(e.children||[])){if(mt(c,s))return c;const f=fnd(c,s);if(f)return f;}return null;}
+  function fndAll(e,s){const r=[];for(const c of(e.children||[])){if(mt(c,s))r.push(c);r.push(...fndAll(c,s));}return r;}
+
+  const _body=new El('body'); const _html=new El('html'); _html.appendChild(_body);
+  const document={body:_body,documentElement:_html,createElement(t){return new El(t);},createElementNS(n,t){return new El(t);},createDocumentFragment(){return new El('fragment');},createTextNode(t){return{nodeType:3,textContent:t,data:t};},getElementById(i){return fnd(_body,'#'+i);},querySelector(s){return fnd(_body,s);},querySelectorAll(s){return fndAll(_body,s);},createEvent(t){return new Ev(t);},addEventListener(){},removeEventListener(){}};
+  globalThis.document=document; globalThis.window=globalThis; globalThis.HTMLElement=El; globalThis.Element=El; globalThis.Event=Ev; globalThis.CustomEvent=Ev; globalThis.NodeList=Array; globalThis.HTMLCollection=Array;
+  globalThis.getComputedStyle=(e)=>e.style; globalThis.requestAnimationFrame=(f)=>setTimeout(f,0); globalThis.cancelAnimationFrame=(i)=>clearTimeout(i);
+  globalThis.MutationObserver=class{observe(){}disconnect(){}}; globalThis.ResizeObserver=class{observe(){}disconnect(){}}; globalThis.IntersectionObserver=class{observe(){}disconnect(){}};
+  globalThis.navigator={userAgent:'node'}; globalThis.location={href:'http://localhost/',pathname:'/',search:'',hash:''}; globalThis.history={pushState(){},replaceState(){},back(){},forward(){}};
+
+  K.registerNative('host-global',a=>{const n=a[0];return(n in globalThis)?globalThis[n]:null;});
+  K.registerNative('host-get',a=>{if(a[0]==null)return null;const v=a[0][a[1]];return v===undefined?null:v;});
+  K.registerNative('host-set!',a=>{if(a[0]!=null)a[0][a[1]]=a[2];return a[2];});
+  K.registerNative('host-call',a=>{const[o,m,...r]=a;if(o==null){const f=globalThis[m];return typeof f==='function'?f.apply(null,r):null;}if(typeof o[m]!=='function')return null;try{return o[m].apply(o,r)||null;}catch(e){return null;}});
+  K.registerNative('host-new',a=>{const C=typeof a[0]==='string'?globalThis[a[0]]:a[0];return typeof C==='function'?new C(...a.slice(1)):null;});
+  K.registerNative('host-callback',a=>{const fn=a[0];if(typeof fn==='function'&&fn.__sx_handle===undefined)return fn;if(fn&&fn.__sx_handle!==undefined)return function(){const r=K.callFn(fn,Array.from(arguments));if(globalThis._driveAsync)globalThis._driveAsync(r);return r;};return function(){};});
+  K.registerNative('host-typeof',a=>{const o=a[0];if(o==null)return'nil';if(o instanceof El)return'element';if(o&&o.nodeType===3)return'text';if(o instanceof Ev)return'event';if(o instanceof Promise)return'promise';return typeof o;});
+  K.registerNative('host-await',a=>{const[p,cb]=a;if(p&&typeof p.then==='function'){const f=(cb&&cb.__sx_handle!==undefined)?v=>K.callFn(cb,[v]):()=>{};p.then(f);}});
+  K.registerNative('load-library!',()=>false);
+
+  globalThis._driveAsync=function driveAsync(r,d){d=d||0;if(d>200||!r||!r.suspended)return;const req=r.request;const items=req&&(req.items||req);const op=items&&items[0];const opName=typeof op==='string'?op:(op&&op.name)||String(op);function doResume(v){try{const x=r.resume(v);driveAsync(x,d+1);}catch(e){}}if(opName==='io-sleep'||opName==='wait')doResume(null);else if(opName==='io-fetch')doResume({ok:true,text:''});else if(opName==='io-settle')doResume(null);else if(opName==='io-wait-event')doResume(null);else if(opName==='io-transition')doResume(null);};
+
+  K.eval('(define SX_VERSION "hs-test-1.0")');
+  K.eval('(define SX_ENGINE "ocaml-vm-sandbox")');
+  K.eval('(define parse sx-parse)');
+  K.eval('(define serialize sx-serialize)');
+
+  const WEB=['render','core-signals','signals','deps','router','page-helpers','freeze','dom','browser','adapter-html','adapter-sx','adapter-dom','boot-helpers','hypersx','engine','orchestration','boot'];
+  const HS=['hs-tokenizer','hs-parser','hs-compiler','hs-runtime','hs-integration'];
+  K.beginModuleLoad();
+  for(const mod of[...WEB,...HS]){const sp=path.join(SX_DIR,mod+'.sx');const lp=path.join(PROJECT,'lib/hyperscript',mod.replace(/^hs-/,'')+'.sx');let s;try{s=fs.existsSync(sp)?fs.readFileSync(sp,'utf8'):fs.readFileSync(lp,'utf8');}catch(e){continue;}try{K.load(s);}catch(e){}}
+  K.endModuleLoad();
+
+  K.eval('(define _test-registry (list))'); K.eval('(define _test-suite "")');
+  K.eval('(define push-suite (fn (name) (set! _test-suite name)))');
+  K.eval('(define pop-suite (fn () (set! _test-suite "")))');
+  K.eval('(define try-call (fn (thunk) (set! _test-registry (append _test-registry (list {:suite _test-suite :thunk thunk}))) {:ok true}))');
+  K.eval('(define report-pass (fn (name) (let ((i (- (len _test-registry) 1))) (when (>= i 0) (dict-set! (nth _test-registry i) "name" name)))))');
+  K.eval('(define report-fail (fn (name error) (let ((i (- (len _test-registry) 1))) (when (>= i 0) (dict-set! (nth _test-registry i) "name" name)))))');
+
+  for(const f of['spec/harness.sx','spec/tests/test-framework.sx','spec/tests/test-hyperscript-behavioral.sx']){try{K.load(fs.readFileSync(path.join(PROJECT,f),'utf8'));}catch(e){}}
+
+  // Run single test
+  _body.children=[]; _body.childNodes=[]; _body.innerHTML='';
+  const suite=K.eval(`(get (nth _test-registry ${testIdx}) "suite")`)||'';
+  const name=K.eval(`(get (nth _test-registry ${testIdx}) "name")`)||`test-${testIdx}`;
+  let ok=false, err=null;
+  try{
+    const thunk=K.eval(`(get (nth _test-registry ${testIdx}) "thunk")`);
+    if(!thunk){err='no thunk';}else{const r=K.callFn(thunk,[]);if(r&&r.suspended)globalThis._driveAsync(r);ok=true;}
+  }catch(e){err=(e.message||'').slice(0,150);}
+  parentPort.postMessage({suite,name,ok,err});
+  process.exit(0);
+}
+
+// ─── Main thread ─────────────────────────────────────────────────
+const PROJECT = path.resolve(__dirname, '..');
+
+async function runTest(idx) {
+  return new Promise((resolve) => {
+    const worker = new Worker(__filename, { workerData: { testIdx: idx } });
+    const timer = setTimeout(() => { worker.terminate(); resolve({ suite: '', name: `test-${idx}`, ok: false, err: 'TIMEOUT' }); }, 8000);
+    worker.on('message', (msg) => { clearTimeout(timer); resolve(msg); });
+    worker.on('error', (e) => { clearTimeout(timer); resolve({ suite: '', name: `test-${idx}`, ok: false, err: 'CRASH: ' + (e.message || '').slice(0, 80) }); });
+    worker.on('exit', (code) => { if (code !== 0) { clearTimeout(timer); resolve({ suite: '', name: `test-${idx}`, ok: false, err: 'EXIT: ' + code }); } });
+  });
+}
+
+async function main() {
+  // First, get test count by loading in main thread
+  const WASM_DIR = path.join(PROJECT, 'shared/static/wasm');
+  eval(fs.readFileSync(path.join(WASM_DIR, 'sx_browser.bc.js'), 'utf8'));
+  const K = globalThis.SxKernel;
+  K.registerNative('host-global',a=>null);K.registerNative('host-get',a=>null);K.registerNative('host-set!',a=>null);K.registerNative('host-call',a=>null);K.registerNative('host-new',a=>null);K.registerNative('host-callback',a=>function(){});K.registerNative('host-typeof',a=>'nil');K.registerNative('host-await',a=>null);K.registerNative('load-library!',()=>false);
+  K.eval('(define SX_VERSION "hs-test-1.0")');K.eval('(define SX_ENGINE "ocaml-vm-sandbox")');K.eval('(define parse sx-parse)');K.eval('(define serialize sx-serialize)');
+  const SX_DIR=path.join(WASM_DIR,'sx');
+  const WEB=['render','core-signals','signals','deps','router','page-helpers','freeze','dom','browser','adapter-html','adapter-sx','adapter-dom','boot-helpers','hypersx','engine','orchestration','boot'];
+  const HS=['hs-tokenizer','hs-parser','hs-compiler','hs-runtime','hs-integration'];
+  K.beginModuleLoad();
+  for(const mod of[...WEB,...HS]){const sp=path.join(SX_DIR,mod+'.sx');const lp=path.join(PROJECT,'lib/hyperscript',mod.replace(/^hs-/,'')+'.sx');let s;try{s=fs.existsSync(sp)?fs.readFileSync(sp,'utf8'):fs.readFileSync(lp,'utf8');}catch(e){continue;}try{K.load(s);}catch(e){}}
+  K.endModuleLoad();
+  K.eval('(define _test-registry (list))');K.eval('(define _test-suite "")');
+  K.eval('(define push-suite (fn (name) (set! _test-suite name)))');
+  K.eval('(define pop-suite (fn () (set! _test-suite "")))');
+  K.eval('(define try-call (fn (thunk) (set! _test-registry (append _test-registry (list {:suite _test-suite :thunk thunk}))) {:ok true}))');
+  K.eval('(define report-pass (fn (n) true))');K.eval('(define report-fail (fn (n e) true))');
+  for(const f of['spec/harness.sx','spec/tests/test-framework.sx','spec/tests/test-hyperscript-behavioral.sx']){try{K.load(fs.readFileSync(path.join(PROJECT,f),'utf8'));}catch(e){}}
+
+  const testCount = K.eval('(len _test-registry)');
+  // Get names
+  const testNames = [];
+  for (let i = 0; i < testCount; i++) {
+    testNames.push({
+      s: K.eval(`(get (nth _test-registry ${i}) "suite")`) || '',
+      n: K.eval(`(get (nth _test-registry ${i}) "name")`) || `test-${i}`,
+    });
+  }
+
+  console.log(`Running ${testCount} tests...`);
+
+  // Run tests — 4 workers at a time
+  const results = [];
+  const BATCH = 4;
+  for (let i = 0; i < testCount; i += BATCH) {
+    const batch = [];
+    for (let j = i; j < Math.min(i + BATCH, testCount); j++) {
+      batch.push(runTest(j).then(r => {
+        r.suite = r.suite || testNames[j].s;
+        r.name = r.name || testNames[j].n;
+        return r;
+      }));
+    }
+    const batchResults = await Promise.all(batch);
+    results.push(...batchResults);
+    if ((i + BATCH) % 100 < BATCH) process.stderr.write(`  ${Math.min(i + BATCH, testCount)}/${testCount}...\n`);
+  }
+
+  // Tally
+  let passed = 0, failed = 0;
+  const cats = {};
+  const errTypes = {};
+  for (const r of results) {
+    if (!cats[r.suite]) cats[r.suite] = { p: 0, f: 0, errs: [] };
+    if (r.ok) { passed++; cats[r.suite].p++; }
+    else {
+      failed++;
+      cats[r.suite].f++;
+      cats[r.suite].errs.push({ name: r.name, err: r.err });
+      let t = 'other';
+      if (r.err === 'TIMEOUT') t = 'timeout';
+      else if (r.err && r.err.includes('NOT IMPLEMENTED')) t = 'stub';
+      else if (r.err && r.err.includes('Assertion')) t = 'assert-fail';
+      else if (r.err && r.err.includes('Expected')) t = 'wrong-value';
+      else if (r.err && r.err.includes('Undefined symbol')) t = 'undef-sym';
+      else if (r.err && r.err.includes('Unhandled')) t = 'unhandled';
+      else if (r.err && r.err.includes('CRASH')) t = 'crash';
+      else if (r.err && r.err.includes('EXIT')) t = 'exit';
+      errTypes[t] = (errTypes[t] || 0) + 1;
+    }
+  }
+
+  console.log(`\nResults: ${passed}/${passed + failed} (${(100 * passed / (passed + failed)).toFixed(0)}%)\n`);
+
+  console.log('By category (sorted by pass rate):');
+  for (const [cat, s] of Object.entries(cats).sort((a, b) => {
+    const ra = a[1].p / (a[1].p + a[1].f);
+    const rb = b[1].p / (b[1].p + b[1].f);
+    return rb - ra;
+  })) {
+    const total = s.p + s.f;
+    const pct = (100 * s.p / total).toFixed(0);
+    const mark = s.f === 0 ? `✓ ${s.p}` : `${s.p}/${total} (${pct}%)`;
+    console.log(`  ${cat}: ${mark}`);
+  }
+
+  console.log('\nFailure types:');
+  for (const [t, n] of Object.entries(errTypes).sort((a, b) => b[1] - a[1])) {
+    console.log(`  ${t}: ${n}`);
+  }
+
+  const uniqueErrors = {};
+  for (const r of results.filter(r => !r.ok)) {
+    const e = (r.err || '').slice(0, 100);
+    if (!uniqueErrors[e]) uniqueErrors[e] = 0;
+    uniqueErrors[e]++;
+  }
+  console.log(`\nUnique errors (${Object.keys(uniqueErrors).length}):`);
+  for (const [e, n] of Object.entries(uniqueErrors).sort((a, b) => b[1] - a[1]).slice(0, 25)) {
+    console.log(`  [${n}x] ${e}`);
+  }
+}
+
+main().catch(e => { console.error(e); process.exit(1); });
diff --git a/tests/hs-parse-audit.js b/tests/hs-parse-audit.js
new file mode 100644
index 00000000..4770eb76
--- /dev/null
+++ b/tests/hs-parse-audit.js
@@ -0,0 +1,117 @@
+#!/usr/bin/env node
+/**
+ * Audit: extract all HS sources from behavioral tests and check parse/compile.
+ * Uses child_process.execSync with timeout to handle hangs.
+ */
+const fs = require('fs');
+const path = require('path');
+const { execSync } = require('child_process');
+
+const PROJECT = path.resolve(__dirname, '..');
+
+// Extract HS sources from test file with their suite/test names
+const testSx = fs.readFileSync(path.join(PROJECT, 'spec/tests/test-hyperscript-behavioral.sx'), 'utf8');
+
+// Extract suites and their test counts from comments
+const suitePattern = /;; ── (\S+) \((\d+) tests\)/g;
+const suites = [];
+let m;
+while ((m = suitePattern.exec(testSx)) !== null) {
+  suites.push({ name: m[1], count: parseInt(m[2]) });
+}
+
+console.log('Test suites (831 total):');
+let grandTotal = 0;
+for (const s of suites) {
+  grandTotal += s.count;
+  console.log(`  ${s.name}: ${s.count}`);
+}
+console.log(`  TOTAL: ${grandTotal}`);
+
+// Categorize tests by type: DOM-action tests vs eval-only tests vs stub tests
+const lines = testSx.split('\n');
+let currentSuite = '';
+let inDeftest = false;
+let testName = '';
+let testBody = '';
+let depth = 0;
+
+const testCategories = {};
+
+for (const line of lines) {
+  const suiteMatch = line.match(/\(defsuite\s+"([^"]+)"/);
+  if (suiteMatch) { currentSuite = suiteMatch[1]; continue; }
+
+  const testMatch = line.match(/\(deftest\s+"([^"]+)"/);
+  if (testMatch) { inDeftest = true; testName = testMatch[1]; testBody = line; depth = 1; continue; }
+
+  if (inDeftest) {
+    testBody += '\n' + line;
+    depth += (line.match(/\(/g) || []).length - (line.match(/\)/g) || []).length;
+    if (depth <= 0) {
+      // Categorize this test
+      if (!testCategories[currentSuite]) testCategories[currentSuite] = { domAction: 0, evalOnly: 0, stub: 0, notImpl: 0, names: [] };
+
+      if (testBody.includes('NOT IMPLEMENTED') || testBody.includes('not-implemented')) {
+        testCategories[currentSuite].stub++;
+      } else if (testBody.includes('dom-dispatch') || testBody.includes('dom-set-inner-html') && testBody.includes('hs-activate!')) {
+        testCategories[currentSuite].domAction++;
+        testCategories[currentSuite].names.push(testName);
+      } else if (testBody.includes('eval-hs') || testBody.includes('hs-eval')) {
+        testCategories[currentSuite].evalOnly++;
+      } else {
+        testCategories[currentSuite].domAction++;
+        testCategories[currentSuite].names.push(testName);
+      }
+
+      inDeftest = false;
+      testBody = '';
+    }
+  }
+}
+
+// Count unique HS sources
+const attrPattern = /dom-set-attr\s+\S+\s+"_"\s+"([^"]+)"/g;
+const hsSources = new Set();
+while ((m = attrPattern.exec(testSx)) !== null) {
+  hsSources.add(m[1].replace(/\\"/g, '"'));
+}
+
+console.log(`\n${hsSources.size} unique HS sources across ${grandTotal} tests`);
+
+// Analyze HS source complexity
+const features = {
+  'on click': 0, 'on load': 0, 'on keyup': 0, 'on mouseenter': 0,
+  'on mutation': 0, 'on intersect': 0, 'on every': 0,
+  'add .': 0, 'remove .': 0, 'toggle .': 0, 'set ': 0, 'put ': 0,
+  'if ': 0, 'repeat': 0, 'wait ': 0, 'send ': 0, 'take ': 0,
+  'transition': 0, 'hide': 0, 'show': 0, 'log': 0,
+  'call ': 0, 'fetch ': 0, 'tell ': 0, 'halt': 0,
+  'morph': 0, 'go ': 0, 'append': 0, 'settle': 0,
+  'def ': 0, 'increment': 0, 'decrement': 0,
+  'bind ': 0, 'closest': 0, 'in ': 0, 'as ': 0,
+  'init': 0, 'every ': 0, 'measure': 0,
+};
+
+for (const src of hsSources) {
+  for (const feat of Object.keys(features)) {
+    if (src.includes(feat)) features[feat]++;
+  }
+}
+
+console.log('\nFeature usage in test sources:');
+for (const [feat, count] of Object.entries(features).sort((a,b) => b[1] - a[1])) {
+  if (count > 0) console.log(`  ${feat.trim()}: ${count}`);
+}
+
+// Summarize categories
+console.log('\nPer-suite breakdown:');
+let totalDom = 0, totalEval = 0, totalStub = 0;
+for (const [suite, cat] of Object.entries(testCategories).sort((a,b) => (b[1].domAction+b[1].evalOnly) - (a[1].domAction+a[1].evalOnly))) {
+  const total = cat.domAction + cat.evalOnly + cat.stub;
+  totalDom += cat.domAction;
+  totalEval += cat.evalOnly;
+  totalStub += cat.stub;
+  console.log(`  ${suite}: ${total} tests (${cat.domAction} DOM, ${cat.evalOnly} eval, ${cat.stub} stub)`);
+}
+console.log(`\nTotals: ${totalDom} DOM-action, ${totalEval} eval-only, ${totalStub} stubs`);
diff --git a/tests/hs-run-timed.js b/tests/hs-run-timed.js
new file mode 100644
index 00000000..201fc6d1
--- /dev/null
+++ b/tests/hs-run-timed.js
@@ -0,0 +1,269 @@
+#!/usr/bin/env node
+/**
+ * Run HS behavioral tests with per-test fork-based timeout.
+ * Forks itself for each test to handle infinite loops.
+ */
+const { execFileSync } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+
+const PROJECT = path.resolve(__dirname, '..');
+const WASM_DIR = path.join(PROJECT, 'shared/static/wasm');
+const SX_DIR = path.join(WASM_DIR, 'sx');
+
+// If called with --run-single N, run just that one test
+if (process.argv.includes('--run-single')) {
+  const idx = parseInt(process.argv[process.argv.indexOf('--run-single') + 1]);
+
+  eval(fs.readFileSync(path.join(WASM_DIR, 'sx_browser.bc.js'), 'utf8'));
+  const K = globalThis.SxKernel;
+
+  // Minimal DOM mock
+  class El {
+    constructor(t) { this.tagName=t.toUpperCase(); this.nodeName=this.tagName; this.nodeType=1; this.id=''; this.className=''; this.classList=new CL(this); this.style={}; this.attributes={}; this.children=[]; this.childNodes=[]; this.parentElement=null; this.parentNode=null; this.textContent=''; this.innerHTML=''; this._listeners={}; this.dataset={}; this.open=false; this.value=''; this.checked=false; this.disabled=false; this.type=''; this.name=''; this.selectedIndex=-1; this.options=[]; }
+    setAttribute(n,v) { this.attributes[n]=String(v); if(n==='id')this.id=v; if(n==='class'){this.className=v;this.classList._sync(v);} if(n==='value')this.value=v; if(n==='disabled')this.disabled=true; }
+    getAttribute(n) { return this.attributes[n]!==undefined?this.attributes[n]:null; }
+    removeAttribute(n) { delete this.attributes[n]; if(n==='disabled')this.disabled=false; }
+    hasAttribute(n) { return n in this.attributes; }
+    addEventListener(e,f) { if(!this._listeners[e])this._listeners[e]=[]; this._listeners[e].push(f); }
+    removeEventListener(e,f) { if(this._listeners[e])this._listeners[e]=this._listeners[e].filter(x=>x!==f); }
+    dispatchEvent(ev) { ev.target=ev.target||this; ev.currentTarget=this; const fns=[...(this._listeners[ev.type]||[])]; for(const f of fns){if(ev._si)break;try{f.call(this,ev);}catch(e){}} if(ev.bubbles&&!ev._sp&&this.parentElement){this.parentElement.dispatchEvent(ev);} return !ev.defaultPrevented; }
+    appendChild(c) { if(c.parentElement)c.parentElement.removeChild(c); c.parentElement=this; c.parentNode=this; this.children.push(c); this.childNodes.push(c); this._updateText(); return c; }
+    removeChild(c) { this.children=this.children.filter(x=>x!==c); this.childNodes=this.childNodes.filter(x=>x!==c); c.parentElement=null; c.parentNode=null; this._updateText(); return c; }
+    insertBefore(n,r) { if(n.parentElement)n.parentElement.removeChild(n); const i=this.children.indexOf(r); if(i>=0){this.children.splice(i,0,n);this.childNodes.splice(i,0,n);}else{this.children.push(n);this.childNodes.push(n);} n.parentElement=this;n.parentNode=this; return n; }
+    replaceChild(n,o) { const i=this.children.indexOf(o); if(i>=0){this.children[i]=n;this.childNodes[i]=n;} n.parentElement=this;n.parentNode=this; o.parentElement=null;o.parentNode=null; return o; }
+    querySelector(s) { return fnd(this,s); }
+    querySelectorAll(s) { return fndAll(this,s); }
+    closest(s) { let e=this; while(e){if(mt(e,s))return e; e=e.parentElement;} return null; }
+    matches(s) { return mt(this,s); }
+    contains(o) { if(o===this)return true; for(const c of this.children)if(c===o||c.contains(o))return true; return false; }
+    cloneNode(d) { const e=new El(this.tagName.toLowerCase()); Object.assign(e.attributes,this.attributes); e.id=this.id; e.className=this.className; e.classList._sync(this.className); Object.assign(e.style,this.style); e.textContent=this.textContent; e.innerHTML=this.innerHTML; e.value=this.value; if(d)for(const c of this.children)e.appendChild(c.cloneNode(true)); return e; }
+    focus(){} blur(){} click(){this.dispatchEvent(new Ev('click',{bubbles:true}));} remove(){if(this.parentElement)this.parentElement.removeChild(this);}
+    _updateText() {}
+    get firstElementChild() { return this.children[0]||null; }
+    get lastElementChild() { return this.children[this.children.length-1]||null; }
+    get nextElementSibling() { if(!this.parentElement)return null; const i=this.parentElement.children.indexOf(this); return this.parentElement.children[i+1]||null; }
+    get previousElementSibling() { if(!this.parentElement)return null; const i=this.parentElement.children.indexOf(this); return i>0?this.parentElement.children[i-1]:null; }
+    showModal(){this.open=true;this.setAttribute('open','');} show(){this.open=true;} close(){this.open=false;this.removeAttribute('open');}
+    getAnimations(){return [];} getBoundingClientRect(){return{top:0,left:0,width:100,height:100,right:100,bottom:100};} scrollIntoView(){}
+    get ownerDocument() { return document; }
+    get offsetParent() { return this.parentElement; }
+    get offsetTop() { return 0; } get offsetLeft() { return 0; }
+    get scrollTop() { return 0; } set scrollTop(v) {} get scrollLeft() { return 0; } set scrollLeft(v) {}
+    get scrollHeight() { return 100; } get scrollWidth() { return 100; }
+    get clientHeight() { return 100; } get clientWidth() { return 100; }
+    insertAdjacentHTML(pos, html) {
+      const el = parseHTMLFragment(html);
+      if (pos === 'beforeend' || pos === 'beforeEnd') this.appendChild(el);
+      else if (pos === 'afterbegin' || pos === 'afterBegin') { if (this.children.length) this.insertBefore(el, this.children[0]); else this.appendChild(el); }
+      else if (pos === 'beforebegin' || pos === 'beforeBegin') { if (this.parentElement) this.parentElement.insertBefore(el, this); }
+      else if (pos === 'afterend' || pos === 'afterEnd') { if (this.parentElement) { const i = this.parentElement.children.indexOf(this); if (i >= 0 && i < this.parentElement.children.length - 1) this.parentElement.insertBefore(el, this.parentElement.children[i+1]); else this.parentElement.appendChild(el); } }
+    }
+  }
+  class CL { constructor(e){this._el=e;this._set=new Set();} _sync(str){this._set=new Set((str||'').split(/\s+/).filter(Boolean));} add(...c){for(const x of c)this._set.add(x);this._el.className=[...this._set].join(' ');this._el.attributes['class']=this._el.className;} remove(...c){for(const x of c)this._set.delete(x);this._el.className=[...this._set].join(' ');this._el.attributes['class']=this._el.className;} toggle(c,f){if(f!==undefined){if(f)this.add(c);else this.remove(c);return f;} if(this._set.has(c)){this.remove(c);return false;}else{this.add(c);return true;}} contains(c){return this._set.has(c);} get length(){return this._set.size;} [Symbol.iterator](){return this._set[Symbol.iterator]();} }
+  class Ev { constructor(t,o={}){this.type=t;this.bubbles=o.bubbles||false;this.cancelable=o.cancelable!==false;this.defaultPrevented=false;this._sp=false;this._si=false;this.target=null;this.currentTarget=null;this.detail=o.detail||null;} preventDefault(){this.defaultPrevented=true;} stopPropagation(){this._sp=true;} stopImmediatePropagation(){this._sp=true;this._si=true;} }
+
+  function parseHTMLFragment(html) {
+    // Minimal HTML parser for test setup
+    const el = new El('div');
+    const m = html.match(/^<(\w+)([^>]*)>([\s\S]*?)<\/\1>$/);
+    if (m) {
+      const tag = m[1]; const attrs = m[2]; const inner = m[3];
+      const child = new El(tag);
+      const attrRe = /(\w[\w-]*)="([^"]*)"/g; let am;
+      while ((am = attrRe.exec(attrs))) child.setAttribute(am[1], am[2]);
+      if (inner) { child.textContent = inner; child.innerHTML = inner; }
+      return child;
+    }
+    el.innerHTML = html; el.textContent = html;
+    return el;
+  }
+
+  function mt(e,s) {
+    if(!e||!e.tagName)return false;
+    s = s.trim();
+    if(s.startsWith('#'))return e.id===s.slice(1);
+    if(s.startsWith('.'))return e.classList.contains(s.slice(1));
+    if(s.startsWith('[')) {
+      const m = s.match(/^\[([^\]=]+)(?:="([^"]*)")?\]$/);
+      if(m) return m[2] !== undefined ? e.getAttribute(m[1]) === m[2] : e.hasAttribute(m[1]);
+    }
+    if(s.includes('.')) { const [tag, cls] = s.split('.'); return e.tagName.toLowerCase() === tag && e.classList.contains(cls); }
+    if(s.includes('#')) { const [tag, id] = s.split('#'); return e.tagName.toLowerCase() === tag && e.id === id; }
+    return e.tagName.toLowerCase() === s.toLowerCase();
+  }
+  function fnd(e,s) { for(const c of(e.children||[])){if(mt(c,s))return c;const f=fnd(c,s);if(f)return f;} return null; }
+  function fndAll(e,s) { const r=[];for(const c of(e.children||[])){if(mt(c,s))r.push(c);r.push(...fndAll(c,s));}return r; }
+
+  const _body = new El('body');
+  const _html = new El('html'); _html.appendChild(_body);
+  const document = {
+    body: _body, documentElement: _html,
+    createElement(t){return new El(t);}, createElementNS(n,t){return new El(t);},
+    createDocumentFragment(){const f=new El('fragment');f.nodeType=11;return f;},
+    createTextNode(t){return{nodeType:3,textContent:t,data:t};},
+    getElementById(i){return fnd(_body,'#'+i);},
+    querySelector(s){return fnd(_body,s);}, querySelectorAll(s){return fndAll(_body,s);},
+    createEvent(t){return new Ev(t);}, addEventListener(){}, removeEventListener(){},
+  };
+  globalThis.document=document; globalThis.window=globalThis; globalThis.HTMLElement=El; globalThis.Element=El;
+  globalThis.Event=Ev; globalThis.CustomEvent=Ev; globalThis.NodeList=Array; globalThis.HTMLCollection=Array;
+  globalThis.getComputedStyle=(e)=>e?e.style:{}; globalThis.requestAnimationFrame=(f)=>{f();return 0;};
+  globalThis.cancelAnimationFrame=()=>{}; globalThis.MutationObserver=class{observe(){}disconnect(){}};
+  globalThis.ResizeObserver=class{observe(){}disconnect(){}}; globalThis.IntersectionObserver=class{observe(){}disconnect(){}};
+  globalThis.navigator={userAgent:'node'}; globalThis.location={href:'http://localhost/',pathname:'/',search:'',hash:''};
+  globalThis.history={pushState(){},replaceState(){},back(){},forward(){}};
+  globalThis.console = { ...console, error: () => {}, warn: () => {} };
+
+  K.registerNative('host-global',a=>{const n=a[0];return(n in globalThis)?globalThis[n]:null;});
+  K.registerNative('host-get',a=>{if(a[0]==null)return null;const v=a[0][a[1]];return v===undefined?null:v;});
+  K.registerNative('host-set!',a=>{if(a[0]!=null)a[0][a[1]]=a[2];return a[2];});
+  K.registerNative('host-call',a=>{const[o,m,...r]=a;if(o==null){const f=globalThis[m];return typeof f==='function'?f.apply(null,r):null;}if(o&&typeof o[m]==='function'){try{const v=o[m].apply(o,r);return v===undefined?null:v;}catch(e){return null;}}return null;});
+  K.registerNative('host-new',a=>{const C=typeof a[0]==='string'?globalThis[a[0]]:a[0];return typeof C==='function'?new C(...a.slice(1)):null;});
+  K.registerNative('host-callback',a=>{const fn=a[0];if(typeof fn==='function'&&fn.__sx_handle===undefined)return fn;if(fn&&fn.__sx_handle!==undefined)return function(){const r=K.callFn(fn,Array.from(arguments));if(globalThis._driveAsync)globalThis._driveAsync(r);return r;};return function(){};});
+  K.registerNative('host-typeof',a=>{const o=a[0];if(o==null)return'nil';if(o instanceof El)return'element';if(o&&o.nodeType===3)return'text';if(o instanceof Ev)return'event';if(o instanceof Promise)return'promise';return typeof o;});
+  K.registerNative('host-await',a=>{});
+  K.registerNative('load-library!',()=>false);
+
+  globalThis._driveAsync=function driveAsync(r,d){d=d||0;if(d>500||!r||!r.suspended)return;const req=r.request;const items=req&&(req.items||req);const op=items&&items[0];const opName=typeof op==='string'?op:(op&&op.name)||String(op);function doResume(v){try{const x=r.resume(v);driveAsync(x,d+1);}catch(e){}}if(opName==='io-sleep'||opName==='wait')doResume(null);else if(opName==='io-fetch')doResume({ok:true,text:''});else if(opName==='io-settle')doResume(null);else if(opName==='io-wait-event')doResume(null);else if(opName==='io-transition')doResume(null);};
+
+  K.eval('(define SX_VERSION "hs-test-1.0")');K.eval('(define SX_ENGINE "ocaml-vm-sandbox")');
+  K.eval('(define parse sx-parse)');K.eval('(define serialize sx-serialize)');
+
+  const WEB=['render','core-signals','signals','deps','router','page-helpers','freeze','dom','browser','adapter-html','adapter-sx','adapter-dom','boot-helpers','hypersx','engine','orchestration','boot'];
+  const HS=['hs-tokenizer','hs-parser','hs-compiler','hs-runtime','hs-integration'];
+  K.beginModuleLoad();
+  for(const mod of[...WEB,...HS]){const sp=path.join(SX_DIR,mod+'.sx');const lp=path.join(PROJECT,'lib/hyperscript',mod.replace(/^hs-/,'')+'.sx');let s;try{s=fs.existsSync(sp)?fs.readFileSync(sp,'utf8'):fs.readFileSync(lp,'utf8');}catch(e){continue;}try{K.load(s);}catch(e){process.stderr.write(`LOAD ERROR: ${mod}: ${e.message}\n`);}}
+  K.endModuleLoad();
+
+  K.eval('(define _test-registry (list))');K.eval('(define _test-suite "")');
+  K.eval('(define push-suite (fn (name) (set! _test-suite name)))');
+  K.eval('(define pop-suite (fn () (set! _test-suite "")))');
+  K.eval('(define try-call (fn (thunk) (set! _test-registry (append _test-registry (list {:suite _test-suite :thunk thunk}))) {:ok true}))');
+  K.eval('(define report-pass (fn (n) true))');
+  K.eval('(define report-fail (fn (n e) true))');
+  for(const f of['spec/harness.sx','spec/tests/test-framework.sx','spec/tests/test-hyperscript-behavioral.sx']){
+    try{K.load(fs.readFileSync(path.join(PROJECT,f),'utf8'));}catch(e){process.stderr.write(`TEST LOAD ERROR: ${f}: ${e.message}\n`);}}
+
+  const thunk=K.eval(`(get (nth _test-registry ${idx}) "thunk")`);
+  const suite=K.eval(`(get (nth _test-registry ${idx}) "suite")`)||'';
+  if(!thunk){process.stdout.write(JSON.stringify({ok:false,err:'no thunk',suite}));process.exit(0);}
+  try{const r=K.callFn(thunk,[]);if(r&&r.suspended)globalThis._driveAsync(r);process.stdout.write(JSON.stringify({ok:true,suite}));}
+  catch(e){process.stdout.write(JSON.stringify({ok:false,err:(e.message||'').slice(0,200),suite}));}
+  process.exit(0);
+}
+
+// ─── Main process ────────────────────────────────────────────────
+// First pass: load kernel to get test count and names
+eval(fs.readFileSync(path.join(WASM_DIR, 'sx_browser.bc.js'), 'utf8'));
+const K = globalThis.SxKernel;
+K.registerNative('host-global',a=>null);K.registerNative('host-get',a=>null);
+K.registerNative('host-set!',a=>null);K.registerNative('host-call',a=>null);
+K.registerNative('host-new',a=>null);K.registerNative('host-callback',a=>function(){});
+K.registerNative('host-typeof',a=>'nil');K.registerNative('host-await',a=>null);
+K.registerNative('load-library!',()=>false);
+K.eval('(define SX_VERSION "hs-test-1.0")');K.eval('(define SX_ENGINE "ocaml-vm-sandbox")');
+K.eval('(define parse sx-parse)');K.eval('(define serialize sx-serialize)');
+const WEB=['render','core-signals','signals','deps','router','page-helpers','freeze','dom','browser','adapter-html','adapter-sx','adapter-dom','boot-helpers','hypersx','engine','orchestration','boot'];
+const HS=['hs-tokenizer','hs-parser','hs-compiler','hs-runtime','hs-integration'];
+K.beginModuleLoad();
+for(const mod of[...WEB,...HS]){const sp=path.join(SX_DIR,mod+'.sx');const lp=path.join(PROJECT,'lib/hyperscript',mod.replace(/^hs-/,'')+'.sx');let s;try{s=fs.existsSync(sp)?fs.readFileSync(sp,'utf8'):fs.readFileSync(lp,'utf8');}catch(e){continue;}try{K.load(s);}catch(e){}}
+K.endModuleLoad();
+K.eval('(define _test-registry (list))');K.eval('(define _test-suite "")');
+K.eval('(define push-suite (fn (name) (set! _test-suite name)))');
+K.eval('(define pop-suite (fn () (set! _test-suite "")))');
+K.eval('(define try-call (fn (thunk) (set! _test-registry (append _test-registry (list {:suite _test-suite :thunk thunk}))) {:ok true}))');
+K.eval('(define report-pass (fn (n) true))');K.eval('(define report-fail (fn (n e) true))');
+for(const f of['spec/harness.sx','spec/tests/test-framework.sx','spec/tests/test-hyperscript-behavioral.sx']){try{K.load(fs.readFileSync(path.join(PROJECT,f),'utf8'));}catch(e){}}
+
+const testCount = K.eval('(len _test-registry)');
+const names = [];
+for(let i=0;i<testCount;i++) names.push({
+  s: K.eval(`(get (nth _test-registry ${i}) "suite")`)||'',
+  n: K.eval(`(get (nth _test-registry ${i}) "name")`)||`test-${i}`,
+});
+
+const TIMEOUT_MS = parseInt(process.env.HS_TIMEOUT || '8000');
+const CONCURRENCY = parseInt(process.env.HS_CONCURRENCY || '6');
+const startFrom = parseInt(process.argv[2] || '0');
+const endAt = parseInt(process.argv[3] || String(testCount));
+
+console.log(`Running tests ${startFrom}-${endAt-1} of ${testCount} (timeout=${TIMEOUT_MS}ms, concurrency=${CONCURRENCY})...`);
+
+let passed=0,failed=0;
+const cats={};const errTypes={};
+
+async function runTest(i) {
+  return new Promise((resolve) => {
+    const child = require('child_process').fork(__filename, ['--run-single', String(i)], {
+      stdio: ['pipe', 'pipe', 'pipe', 'ipc'],
+      timeout: TIMEOUT_MS,
+    });
+    let stdout = '';
+    child.stdout.on('data', d => stdout += d);
+    child.on('close', (code, signal) => {
+      if (signal === 'SIGTERM' || code === null) {
+        resolve({ ok: false, err: 'TIMEOUT', suite: names[i].s });
+      } else {
+        try { resolve(JSON.parse(stdout)); }
+        catch(e) { resolve({ ok: false, err: stdout.slice(0,150) || `exit ${code}`, suite: names[i].s }); }
+      }
+    });
+    child.on('error', (e) => {
+      resolve({ ok: false, err: 'FORK: ' + (e.message||'').slice(0,100), suite: names[i].s });
+    });
+  });
+}
+
+async function main() {
+  // Run in batches
+  for (let i = startFrom; i < endAt; i += CONCURRENCY) {
+    const batch = [];
+    for (let j = i; j < Math.min(i + CONCURRENCY, endAt); j++) batch.push(j);
+    const results = await Promise.all(batch.map(runTest));
+
+    for (let k = 0; k < results.length; k++) {
+      const r = results[k];
+      const idx = batch[k];
+      const suite = r.suite || names[idx].s;
+      if (!cats[suite]) cats[suite] = { p: 0, f: 0, errs: [] };
+
+      if (r.ok) { passed++; cats[suite].p++; }
+      else {
+        failed++; cats[suite].f++; cats[suite].errs.push({ name: names[idx].n, err: r.err });
+        let t = 'other';
+        if (r.err === 'TIMEOUT') t = 'timeout';
+        else if (r.err && r.err.includes('NOT IMPLEMENTED')) t = 'stub';
+        else if (r.err && r.err.includes('Assertion')) t = 'assert-fail';
+        else if (r.err && r.err.includes('Expected')) t = 'wrong-value';
+        else if (r.err && r.err.includes('Undefined symbol')) t = 'undef-sym';
+        else if (r.err && r.err.includes('Unhandled')) t = 'unhandled';
+        errTypes[t] = (errTypes[t] || 0) + 1;
+      }
+    }
+    if ((i + CONCURRENCY) % 50 < CONCURRENCY) {
+      process.stderr.write(`  ${Math.min(i + CONCURRENCY, endAt)}/${endAt} (${passed} pass)...\n`);
+    }
+  }
+
+  console.log(`\nResults: ${passed}/${passed+failed} (${(100*passed/(passed+failed)).toFixed(0)}%)\n`);
+
+  console.log('By category:');
+  for (const [cat, s] of Object.entries(cats).sort((a, b) => {
+    const ra = a[1].p / (a[1].p + a[1].f); const rb = b[1].p / (b[1].p + b[1].f); return rb - ra;
+  })) {
+    const total = s.p + s.f; const pct = (100 * s.p / total).toFixed(0);
+    const mark = s.f === 0 ? `\u2713 ${s.p}` : `${s.p}/${total} (${pct}%)`;
+    console.log(`  ${cat}: ${mark}`);
+  }
+
+  console.log('\nFailure types:');
+  for (const [t, n] of Object.entries(errTypes).sort((a, b) => b[1] - a[1])) console.log(`  ${t}: ${n}`);
+
+  const ue = {};
+  for (const [cat, s] of Object.entries(cats)) for (const { err } of s.errs) { const e = (err || '').slice(0, 120); ue[e] = (ue[e] || 0) + 1; }
+  console.log(`\nUnique errors (${Object.keys(ue).length}):`);
+  for (const [e, n] of Object.entries(ue).sort((a, b) => b[1] - a[1]).slice(0, 30)) console.log(`  [${n}x] ${e}`);
+}
+
+main().catch(e => { console.error(e); process.exit(1); });