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Neil
080c562898
Every changed-path gate asked git for `--merge-base "$BASE_SHA" "$HEAD_SHA"`, which needs the event payload's base SHA to be in the local graph. That is the only reason two jobs cloned all 8127 refs' history. On a pull_request checkout HEAD is already the merge commit, so its first parent is the base side and no merge base has to be computed. config/scripts/git-pull-request-diff-base.mjs resolved that for the two Node gates; the workflow's inline gates now use the same helper through a small CLI rather than open-coding it. code_paths gates all 22 jobs, so its checkout is charged to the start of every one of them: measured 20.7s to 1.6s, keeping blob:none because its sparse tree is ~7 files and leaves no blobs to refetch. Static analysis drops the filter instead, since populating all 30,226 files makes blob:none force a second promisor fetch: 23s to ~11s. Verified on a real merge ref. At depth 50 the old and new forms produce identical changed-file sets. At depth 2 the new form still works and the old one fails with `fatal: bad object`, which is the failure a stale base would have caused once the checkout stopped being complete. Also drops the dead resolveBase + merge-base prelude in the changed-code gate, whose result resolvePullRequestDiffBase already discarded on every PR.