giles e3e5d3e888 scheme: Phase 5a — call/cc + 8 tests ...

scheme-standard-env binds:
- call/cc                            — primary
- call-with-current-continuation     — alias

Implementation wraps SX's host call/cc, presenting the captured
continuation k as a Scheme procedure that accepts a single value
(or a list of values for multi-arg invocation). Single-shot
escape semantics: when k is invoked, control jumps out of the
surrounding call/cc form. Multi-shot re-entry isn't safely
testable without delimited-continuation infrastructure (the
captured continuation re-enters indefinitely if invoked after
the call/cc returns) — deferred to a follow-up commit if needed.

Tests cover:
- No-escape return value
- Escape past arithmetic frames
- Detect/early-exit idiom over for-each
- Procedure? on the captured k

220 total Scheme tests now (62 + 23 + 49 + 78 + 8).

2026-05-14 06:27:03 +00:00

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