fix: certification corpus selection supports fresh-capture snapshots - #178
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The #162B/#162C spent corpora derive from one snapshot (239 proposals, digest 1d1de9f7...). A fresh certification capture has a different snapshot identity and, with a different snapshot key, non-comparable HMAC sample IDs. Selection now: allows the fresh capture, requires the prior snapshot to resolve spent content hashes, excludes and proves disjointness on BOTH sample IDs and content hashes (a re-keyed capture cannot launder a spent case back in), and records the identity basis in the manifest. The freeze gate validates the basis.
This was referenced Sep 5, 2026
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Follow-up to #177 (#162D machinery), found by verifying the selection gate against the real spent artifacts: both the #162B dev tranche and #162C holdout manifest derive from ONE snapshot (239 proposals, digest
1d1de9f7…), so the original gate's same-identity requirement would reject every fresh capture.Changes:
select_certification_corpusnow allows a fresh capture (different snapshot identity) whenprior_snapshotis supplied; resolves the spent corpora's content hashes from it (key-independent identities).certification_content_hash_overlaps_*).spent_snapshot_identities,same_snapshot_as_spent, andidentity_basis; the freeze gate validates the basis.--prior-snapshot. 3 new tests (39 total passing); ruff + mypy --strict clean.