giles c50f5d5155 go: goroutine-panic propagation + 8 corner tests → eval 100/100, Phase 6 acceptance cleared [shapes-scheduler] ...

Wired panic through :go stmt (v0 sync surfaces back to spawner —
matches real Go's "crash whole program" end-effect) and through
go-eval-for (was swallowing panic at the loop boundary).

8 tests added: goroutine-panic-surfaces, goroutine-recover-via-
spawner-defer, multi-defer-LIFO-with-recover, defer-fires-on-panic-
path, panic(nil), panic-in-loop, defer-still-runs-in-panicking-fn,
args-eager-on-panic-path. 20 Phase-6 tests total; +20 acceptance
bar cleared (eval/ 80 → 100).

Shape: 4 control-flow sites now repeat the same sentinel dispatch
arm (return-value, break, continue, eval-error, go-panic). The
scheduler kit should bake in a single propagates? helper rather
than have each guest evaluator list every sentinel inline — diary
documents the cross-cutting abstraction.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-27 23:54:56 +00:00

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