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`workflow_dispatch` with a `force_build` boolean, honoured inside each of the three reuse steps. It exists because skip-if-exists made its own build path untestable. `agent/` has not changed since 2026-07-17, so the agent build has correctly declined to run on every push since — which also means #3190, whose whole symptom lives on that path, cannot be reproduced on demand. Editing build.yml does not force a build either, and that is deliberate: the workflow is not shipped bytes, so it is in no artifact's path set, and putting it in one would re-version every artifact for a comment change. That is also why this lands before step 2 rather than after. Step 1 moved the builds onto a container driver and turned attestations off; the claim that `fc.revision` still reads back cannot be checked until something actually builds under that driver. Run 4887 confirmed only the cheaper half — `Set up buildx` succeeded on all three jobs, so the buildkit sibling container does start against the mounted socket. Details worth keeping: * FORCE is checked in the reuse step, not in the build step's `if:`. The repoint step keys off `hit` too, and a force that bypassed only the build would leave the two disagreeing about what had happened. * `github.event.inputs`, not the `inputs` context — release.yml already uses that form and it is the one this runner is known to evaluate. Read through env rather than interpolated into the run block, same as release.yml's TAG. * One input, not one per artifact. Three booleans is an interface nobody remembers. Scribe #3252, #3249. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>