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Closes #80. script/lint decided whether it could skip the pinned image by asking what version was on PATH rather than where it was running, and cache isolation is part of that same question. Both issues are that one defect. The cache was one directory per repo, shared by every worktree on the host. Two checkouts of this repo have identical Go file contents, so their cache keys collide and golangci-lint replays the stored analysis, including the paths recorded when it was produced. The loud direction of that failure - a clean tree failed by a dirty sibling - is the harmless one. The silent direction, a dirty tree passed by a clean sibling, is another way for a gate here to report a green it did not earn. The cache is now keyed on a digest of the worktree path, so a collision is not possible, and it stays persistent per worktree: a warm run is still seconds. Each cache records the worktree it belongs to and is collected when that worktree is gone, so throwaway worktrees do not accumulate caches; the tree lives under XDG_CACHE_HOME and is disposable by definition. Collection makes the tree writable first, since the Go module cache inside it is deliberately read-only, and never lets a failure to tidy up fail the lint: the first cut did exactly that, and a gate failing for a housekeeping reason is its own bug. script/lint-audit is the backstop, and runs on every lint: it rejects output citing any file that is not in the tree being linted, so a result built out of another checkout's analysis is a hard error instead of a silent pass. It runs on clean output too, because that is the case nobody investigates. It never certifies that a run passed - it does not look at whether there were findings - so it cannot itself become a gate that reports a green. golangci-lint's "parallel golangci-lint is running" refusal is now a bounded retry rather than a verdict. It is not a lint result, and exiting non-zero on it is indistinguishable to a caller from real findings; issue #88 measured that a private cache does not remove the contention. Exhausting the retries fails with a message that says the tree was never analysed. The native path now requires VAULTIK_LINT_IN_CONTAINER=1, which only the Dockerfile's lint stage sets, in addition to matching the pin. A developer's locally installed 2.12.2 is a different build reached by a different code path and no longer bypasses the digest pin. /.dockerenv was considered and rejected as the signal: dockerd creates it for `docker run`, but it is not reliably present during a BuildKit `docker build`, which is exactly the case the exception exists for. Inside the container a version mismatch is now a hard error rather than a fall-through, since there is no daemon there to fall through to. Version detection uses `golangci-lint version --short`, the interface meant for it, keeping the banner scrape only as a fallback. script/bootstrap no longer prints "bootstrap complete" on a machine that cannot run the gate. Docker missing, or present with an unreachable daemon, is a hard failure naming exactly what breaks. Installing docker from bootstrap was rejected: it needs root, a daemon, and on macOS a GUI cask, so the attempt would itself fail in the common case and trade one false success for a second failure mode. TODO.md's claim that `make check` became "as trustworthy as script/cibuild" is corrected to what README.md already said: only the lint leg is equivalent, while tests and gofmt still run against the host toolchain. README.md's requirements section gains docker and sqlite3. Verified by reproduction, not inspection: two concurrent lints from two worktrees of differing cleanliness each reported only their own findings with no lock error; a real run made to report paths outside its tree exits 1; a matching linter shimmed onto PATH is never invoked while the pinned image runs; a PATH without docker makes bootstrap fail. script/ cibuild exits 0 with the lint layer executing in the pinned image, which is what proves the in-container path still works.
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