Reactive tracking (deref/computed/effect dep discovery) and island lifecycle
now use the general scoped effects system instead of parallel infrastructure.
Two scope names: "sx-reactive" for tracking context, "sx-island-scope" for
island disposable collection. Eliminates ~98 net lines: _TrackingContext class,
7 tracking context platform functions (Python + JS), *island-scope* global,
and corresponding RENAME_MAP entries. All 20 signal tests pass (17 original +
3 new scope integration tests), plus CEK/continuation/type tests clean.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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>
