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The review gate re-ran almost every selected witness on every round even when the executor's fix was twelve lines: the ledger fingerprint and the diff selection both worked on whole files, and the card hosts are thirteen thousand lines each. On #500 those twelve lines in houseplan-editor-runtime.ts pulled 53 of the 75 witnesses the third round ran, and the gate cost 140 job-minutes and an hour of the reviewer's wall clock across three rounds. The patch side is now judged by the anchor's neighbourhood — the anchor lines plus ANCHOR_RADIUS_LINES on each side — in both the ledger fingerprint and the diff selection, which now reads hunk ranges from git diff --unified=0. The guard side keeps whole-file granularity: a guard has no anchor and changes as a whole. An anchor that is not found exactly once falls back to the whole file, and so does a file whose hunks were not read: not knowing is not proof. Same class of approximation as the existing diff selection, with the nightly full gate (#513) as the floor. Two more cuts to the wall clock of a review round. The shard plan is now computed before the environment is installed — restore the ledger, select, split, and only then pay for npm ci, Python and Chromium; the job still runs, so the review gate's proof (#510) is unaffected. And the matrix goes from three shards to six: the same job-minutes, half the wall time. On the #500 round the selection drops 60 → 7. Four witnesses guard the new logic, including the two unsafe defaults (ambiguous anchor, missing hunks). Issue: #518 User-Visible: no