HS: wait on event basics (+4 tests)

Five parts: (a) tests/hs-run-filtered.js `io-wait-event` mock now
registers a one-shot listener on the target element and resumes with
the event, instead of immediately resuming with nil. (b) Added
hs-wait-for-or runtime form carrying a timeout-ms; mock resumes
immediately when a timeout is present (0ms tests). (c) parser
parse-wait-cmd recognises `wait for EV(v1, v2)` destructure syntax,
emits :destructure list on wait-for AST. (d) compiler emit-wait-for
updated for :from/:or combos; a new `__bind-from-detail__` form
compiles to `(define v (host-get (host-get it "detail") v))`, and the
`do`-sequence handler preprocesses wait-for to splice these synthetic
bindings after the wait. (e) generator extracts `detail: ...` from
`CustomEvent` options so dispatched events carry their payload.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/hyperscript/runtime.sx

@@ -48,11 +48,17 @@
 (define hs-wait (fn (ms) (perform (list (quote io-sleep) ms))))
 
 ;; Wait for CSS transitions/animations to settle on an element.
-(define
-  hs-wait-for
-  (fn
-    (target event-name)
-    (perform (list (quote io-wait-event) target event-name))))
+(begin
+  (define
+    hs-wait-for
+    (fn
+      (target event-name)
+      (perform (list (quote io-wait-event) target event-name))))
+  (define
+    hs-wait-for-or
+    (fn
+      (target event-name timeout-ms)
+      (perform (list (quote io-wait-event) target event-name timeout-ms)))))
 
 ;; ── Class manipulation ──────────────────────────────────────────