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fix(698): compare the recorded base exactly, never parse it out
Review round 5 returned BLOCKED with one High, and it needed no forgery and no #697 —
just a branch name.

`main)evil` IS A VALID GIT BRANCH NAME (`git check-ref-format --branch 'main)evil'`
succeeds). A genuine human verdict earned while head H targeted it is written
`(base: main)evil)`. Truncating at the first `)` yields exactly `main`, which matches a
PR that has since been retargeted onto `main`, so the verdict is inherited over a
completely different diff.

I had asserted the opposite in a code comment one commit earlier — that a `)` in a
branch name "mismatches — safe direction". That was generalised from `feat/foo)bar`,
which does mismatch, and is false for EVERY branch whose name starts with the target
base. Two attempts at extracting this value have now been defeated (`##` last-marker by
an appended marker, `#` first-marker by this), so the lesson is the shape, not the
off-by-one: do not parse a value out of user- or attacker-influenced text when you can
compare against the exact expected literal instead.

The description must now END with the literal `(base: <this PR's base>)` AND contain
exactly ONE marker — the marker count kills the append trick without having to decide
which occurrence is authoritative. Pure shell (`${#}` arithmetic), no truncation to
abuse. Verified across all six shapes, including a PR that legitimately targets
`main)evil` (accepted) and `(base: )` (rejected). Absent markers remain accepted, since
verdicts predating #632 carry none.

Mutation-verified: restoring the truncating parse reddens only the new paren test, while
the appended-marker, matching-base and legacy tests stay green.

385 tests pass. Note for the record: pytest has never executed inside the review sandbox
in any of the five rounds, so the suite has only ever been run here.

Refs: #698
Decisions-Edit: yes
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-07-30 20:51:57 +02:00
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