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* fix(#2452): stop shallow-fetching the base ref in three-dot-diff CI gates `mutation.yml` re-fetched the base branch with `--depth=1` after checking out with `fetch-depth: 0`. The shallow re-fetch truncates the base ref's ancestry, so `git diff --name-only origin/<base>...HEAD` in scripts/mutation-matrix.cjs can no longer compute a merge base and aborts with `fatal: origin/next...HEAD: no merge base` (exit 2). The `detect` job then fails and the `mutate` shards never run — so the 80% mutation-score threshold went UNVERIFIED rather than enforced. The failure is branch-position dependent, which is why it went unnoticed: a branch already level with the base incidentally passes (its merge base IS the single fetched commit), while a branch that is BEHIND fails. Observed on PRs #2436 and #2005. `changeset-required.yml` and `docs-required.yml` shallow-fetched the base ref too (`--depth=50`), shrinking the same window further. All three now fetch the BASE REF unshallowed. Their shallow *checkout* depth is left at 50: that is a separate, deliberate cost control with fail-closed semantics, owned by tests/policy-lint-shallow-checkout.test.cjs. Only the base-ref fetch changes. The two `${{ }}` interpolations in mutation.yml's run: blocks now pass the base name through `env:`, matching the sibling workflows. Regression coverage in tests/mutation-workflow-base-ref.test.cjs: - a per-workflow contract guard asserting the base fetch carries no --depth (RED on origin/next for all three files, GREEN here). The YAML step parser handles block scalars and skips commented-out steps, so a future refactor to a multi-line `run:` cannot silently degrade the guard. - a real-git mechanism proof with boundary coverage at the shallow edge: with the base advanced 60 commits past the branch point, --depth=1 and --depth=60 both fail with `no merge base`, --depth=61 (merge base exactly at the boundary) succeeds, and an unbounded fetch succeeds. Each variant uses an independent clone, because a plain fetch does not un-shallow a repo that already carries a .git/shallow boundary. Also fixes a startup race in tests/run-with-timeout.test.cjs surfaced by this branch's gsd-test run (C1, linux-node24). The heartbeat file only appeared ~100ms after the grandchild's runtime was up, but the window is 1s spanning two cold node starts, so on a loaded runner the timeout fired before any heartbeat existed and the precondition failed for reasons unrelated to reaping. The child now writes its heartbeat once synchronously at startup; the frozen-vs-ticking comparison that actually proves reaping is unchanged. Closes #2452 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * docs(changeset): backfill PR number to 2485 --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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