sneak b6e0be8e51 WIP: cache-bust the make check layer via CHECK_EPOCH (refs #23) ...

Incomplete - do not merge. Preserved so the analysis is not lost.

The Dockerfile declares an ARG CHECK_EPOCH with no default, guards
against it being unset, and expands it into the RUN line so the check
layer is invalidated on every invocation while the script/bootstrap
toolchain layer above it still caches. script/cibuild generates a
per-invocation value.

Known incomplete:

- script/docker was never updated to pass CHECK_EPOCH, so `make docker`
  would fail the guard. The Dockerfile header already claims it does.
  That claim is currently false.
- Diverges from the canonical upstream shape tracked in prompts #26;
  the intended next step was to simplify to match it rather than keep
  the bespoke guard.
- No verification was run: neither the two-consecutive-runs proof nor
  the deliberate-failure proof required by the issue.

2026-08-09 14:14:59 +00:00

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