docs(session-projection-cache): land the read-compat note as implemented and state fixture provenanc

Review follow-ups: the Agent Note triplet moves to implemented/ rewritten as shipped state (Decision/Consequences/Testing, present tense), cross-linked both way

Update

Review follow-ups: the Agent Note triplet moves to implemented/ rewritten as shipped state (Decision/Consequences/Testing, present tense), cross-linked both ways with the 2026-07-28 storage recovery proposal whose projcache reset/destroy path it supersedes (that proposal stays live for authoritative and whole-medium damage). The fixtures spec header and the note state the fixture provenance as rec

Date
2026-09-02
Version
master@db2dd2f
commit
db2dd2f

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Review follow-ups: the Agent Note triplet moves to implemented/ rewritten as shipped state (Decision/Consequences/Testing, present tense), cross-linked both ways with the 2026-07-28 storage recovery proposal whose projcache reset/destroy path it supersedes (that proposal stays live for authoritative and whole-medium damage). The fixtures spec header and the note state the fixture provenance as rec