chore: close out P1 findings

Resolve all three P1 items: per-operation DB sessions, ServiceError
user-facing failures, and user_version schema migrations. Add the
implementation plan doc.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
2026-06-10 19:31:58 -04:00
parent 98ea8a1a5c
commit c29d862774
2 changed files with 1248 additions and 3 deletions
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