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Closes #80. script/lint pointed GOLANGCI_LINT_CACHE at a path shared by every worktree of this repo. Two worktrees have identical Go file contents, so their cache keys collided and one tree's stored findings replayed for another, paths included - observed as 231 findings all citing another session's worktree, with no parallel-runner message to signal it. The failure is symmetric and only one direction is loud: a clean tree failed by a dirty sibling gets investigated, a dirty tree passed by a clean sibling does not. The cache is now keyed per worktree on a digest of $ROOT, and remains persistent. Independently of that, script/lint-audit inspects every run's output and fails the run if any finding cites a path outside the tree being linted. That guard is the load-bearing part: it converts a silent unearned green into a hard error regardless of how the cache is keyed. It is deliberately built so it can never certify a pass, only reject, so it cannot itself become a gate that reports green. The native path was gated on version equality alone, which admitted a locally installed matching binary and bypassed the digest pin. It now requires VAULTIK_LINT_IN_CONTAINER=1, set only by the Dockerfile lint stage, in addition to version equality. /.dockerenv was rejected as the signal because dockerd creates it for `docker run` but not reliably during a BuildKit `docker build`, which is the case the exception exists for. A version mismatch inside the container is now a hard error rather than a fall-through. This mattered more than the issue supposed: on this host a matching golangci-lint exists on PATH, so script/lint was taking the native path and linting against the global cache without ever running the pinned image. That is the likely root of the observed contamination, and it is closed here rather than mitigated. The parallel-runner error is retried rather than reported. It is not a lint result, and surfacing it as a non-zero exit is indistinguishable to a caller from real findings; exhausted retries fail saying the tree was never analysed. Note that a private cache alone does not remove lock contention - measured with two concurrent runs using separate cache directories. script/bootstrap no longer reports success on a machine that cannot run the gate: docker is now required by lint, check and precommit, so a missing binary or unreachable daemon is a hard failure naming what will not work.
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