giles a97f4c0e39 Add reactive islands spec: signals.sx + defisland across all adapters ...

New spec file signals.sx defines the signal runtime: signal, computed,
effect, deref, reset!, swap!, batch, dispose, and island scope tracking.

eval.sx: defisland special form + island? type predicate in eval-call.
boundary.sx: signal primitive declarations (Tier 3).
render.sx: defisland in definition-form?.
adapter-dom.sx: render-dom-island with reactive context, reactive-text,
  reactive-attr, reactive-fragment, reactive-list helpers.
adapter-html.sx: render-html-island for SSR with data-sx-island/state.
adapter-sx.sx: island? handling in wire format serialization.
special-forms.sx: defisland declaration with docs and example.

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

2026-03-08 09:34:47 +00:00

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