Create/Get for submission (including the one legitimate status
transition — submission is not append-only, unlike the other three),
Create/GetLatest for extraction and evidence_package, Create for
finding plus ListCurrentFindings which applies the anti-join documented
in the migration (a finding referenced by another row's `supersedes`
is not "current").
Tested against real Postgres, including that the append-only trigger
still rejects UPDATE on evidence_package via this new code path, and
that ListCurrentFindings actually hides a finding once a correction
supersedes it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
