fix(verify): normalise the pytest summary duration when it carries a (H:MM:SS) suffix (AGT-4680)

[unohee]

Summary

• The pytest -q summary line gains (0:02:04) once a run passes a minute. The duration normaliser required the line to end right after the seconds, so the suffix kept the run time in the failure fingerprint.
• Every full cgf-portal run is 113-149 s, so base and head fingerprints always differed, hasSameFailure was false, and a failure already on main was reported to the worker as a new failure.
• The suffix is now optional in the regex in src/verify/runner.ts.

Evidence

• After the 2026-10-03 23:24 restart, AX-1644 and AX-1767 (unrelated issues, neither touched B5) both got tests failed for tests/test_b5_repository.py::test_the_empty_result_has_the_same_shape_as_a_real_one.
• Clean origin/main fails that test deterministically (2 of 2 runs), so it is not the workers' regression.
• A probe of normalizeFailureOutput on in 124.27s (0:02:04) vs in 113.47s (0:01:53) returned equal=false before the change.

Tests

• fingerprintStability.test.ts: two summaries differing only in duration and suffix normalise equal; a different failure count still differs.
• Mutation: reverting the regex makes only the new test fail.
• npx vitest run src/verify src/agents/deterministicTester: 202 passed. tsc --noEmit clean.