giles e7169af985 HS: when :count changes — scoped watch + parse-cmd feature boundary fix ...

Three-part fix for element-scoped reactive expressions:

1. Parser: add when/bind to parse-cmd's feature-keyword nil set so
   `... then when X changes ...` is parsed as a new feature, not absorbed
   into the preceding on-handler body as a (ref "when") expression.

2. Parser: parse-when-feat now recognises local (:var) token type so
   `when :count changes ...` dispatches to the when-changes branch.

3. Runtime + compiler: hs-scoped-set! now fires hs-scoped-fire-watchers!
   on change; new hs-scoped-watch! / hs-scoped-fire-watchers! registry;
   compiler emits (hs-scoped-watch! me name (fn (it) body)) for local
   expressions in when-changes AST nodes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-05 02:59:15 +00:00

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