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Self-found while writing the round-5 review brief, by asking what an attacker who can influence the status description (#697) could do to the parse I had just added. `${ex_desc##*"(base: "}` is greedy, so it reads the LAST occurrence. A description of `Review-verdict: MERGEABLE @ abc1234 (base: probe/scratch) (base: main)` therefore parsed as `main`, matched the PR's base, and the verdict was inherited — reopening the exact hole the base check was added to close, one commit earlier. Measured both forms before choosing: first-match yields `probe/scratch`, mismatches, and fails closed. Two adjacent cases confirmed to fail in the safe direction: a `)` inside a branch name truncates the value (mismatch), and an empty `(base: )` is present-but-different (mismatch), so neither is waved through by the legacy-absent-base allowance. Tests for both, and the appended-base test is mutation-verified: restoring `##` reddens it. 384 tests pass. Refs: #698 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>