giles 26320abd64 Add signal test suite (17/17) and Island type to evaluator ...

test-signals.sx: 17 tests covering signal basics (create, deref, reset!,
swap!), computed (derive, update, chain), effects (run, re-run, dispose,
cleanup), batch (deferred deduped notifications), and defisland (create,
call, children).

types.py: Island dataclass mirroring Component but for reactive boundaries.
evaluator.py: sf_defisland special form, Island in call dispatch.
run.py: Signal platform primitives (make-signal, tracking context, etc)
  and native effect/computed/batch implementations that bridge Lambda
  calls across the Python↔SX boundary.
signals.sx: Updated batch to deduplicate subscribers across signals.

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

2026-03-08 09:44:18 +00:00

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