The exact patch pin made every gate unrunnable on any host without that precise build. cpython-3.12.13 is not published for linux-x86_64, so `uv sync --locked` failed outright there and there was no local run at all — for a project whose merge bar IS the local run, that is the failure mode that matters. It is how test_lane_sha_verifier.py and 99 register-matrix tests sat red on clean main without anyone seeing them. Safe because the pin was not load-bearing for reproducibility: the committed trace_hash / content_sha256 / lane-SHA pins were established under 3.12.13 and reproduce byte-for-byte under 3.12.11 (119 hash-pinned tests, 118 pass; the one failure is a stale lane roster that fails on 3.12.13 too). The minor version stays bounded — 3.13 is a real upgrade decision, not a patch bump. .python-version follows to "3.12" so uv resolves any patch release. [Verification]: `uv lock` regenerated — the ENTIRE diff is one line, requires-python "==3.12.13" -> "==3.12.*". All 217 packages resolve to identical versions; no dependency moved. `uv sync --locked` now succeeds on linux-x86_64, which it could not do before this change. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FduW6Krm3PPQv3P5iwBYtx
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