The proposer issue only lists auto-proposable fixes (currently the TBB
signatures), so every failure without a signature -- and every group blocked on
a dependency build -- was invisible unless someone read the run log. That hid
the classifier's blind spots and, with them, which new signatures are worth
adding next.
Extend the tracker to surface those blind spots and give them the same
visibility as the proposals:
- add pure `unclassified_summary()` (unknown-signature groups ranked by build
count, capped with an explicit dropped count) and `blocked_summary()` helpers
- print both sections in proposal-tracking.R and add a `--open-issue` mode that
posts/updates a "Unclassified build failures (needs signatures)" Forgejo issue
- run the tracker with --open-issue in the weekly crow pipeline (second issue)
- cover the new helpers with tests and document the flow in the patches README
pat-s
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