htmx demos working: activation, fetch, swap, OOB filtering, test runner page

- htmx-boot-subtree! wired into process-elements for auto-activation
- Fixed cond compilation bug in hx-verb-info (Clojure-style flat cond)
- Platform io-fetch upgraded: method/body/headers support, full response dict
- Replaced perform IO ops with browser primitives (set-timeout, browser-confirm, etc)
- SX→HTML rendering in hx-do-swap with OOB section filtering
- hx-collect-params: collects input name/value for all methods
- Handler naming: ex-{slug} convention, removed perform IO dependencies
- Test runner page at (test.(applications.(htmx))) with iframe-based runner
- Header "test" link on every page linking to test URL
- Page file restructure: 285 files moved to URL-matching paths (a/b/c/index.sx)
- page-functions.sx: ~100 component name references updated
- _test added to skip_dirs, test- file prefix convention for test files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

shared/static/wasm/sx/orchestration.sx

@@ -415,6 +415,14 @@
                       (swap-dom-nodes t oob s)
                       (post-swap t)))
                   (hoist-head-elements container)
+                  (let
+                    ((manifest-el (dom-query-in container "script[data-sx-manifest]")))
+                    (when
+                      manifest-el
+                      (host-call
+                        (host-global "Sx")
+                        "mergeManifest"
+                        manifest-el)))
                   (let
                     ((html (select-from-container container select-sel)))
                     (with-transition
@@ -1547,7 +1555,8 @@
         (process-sse root)
         (bind-inline-handlers root)
         (process-emit-elements root)
-        (hs-boot-subtree! (or root (host-global "document")))))
+        (hs-boot-subtree! (or root (host-global "document")))
+        (htmx-boot-subtree! (or root (host-global "document")))))
     (define
       process-one
       :effects (mutation io)
@@ -1622,9 +1631,11 @@
             (pathname (url-pathname url)))
           (when
             target
-            (let
-              ((headers (dict "SX-Request" "true")))
-              (fetch-and-restore target url headers scrollY))))))
+            (when
+              (not (try-client-route pathname target-sel))
+              (let
+                ((headers (build-request-headers target (loaded-component-names))))
+                (fetch-and-restore target url headers scrollY)))))))
     (define
       engine-init
       :effects (mutation io)