giles 98fd315f14 Step 10c: unified reactive model — peek + provide! special forms + tracking primitives ...

CEK evaluator integration:
- peek — non-tracking read from provide frame (like context but never subscribes)
- provide! — mutate value in provide frame (cf_extra made mutable)
- Both dispatch as special forms alongside provide/context

Scope-stack primitives (for adapter/island use):
- provide-reactive! / provide-pop-reactive! / provide-set! — signal-backed scope
- peek (primitive) — non-tracking scope read
- context (override) — tracking-aware scope read
- bind — tracked computation with auto-resubscription
- tracking-start! / tracking-stop! / tracking-active? — tracking context

12/13 user-authored peek/provide! tests pass.
bind integration with CEK context pending (scope vs kont gap).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-05 02:10:26 +00:00

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