- ProposalConcurrencyTests (shared-connection SQLite, two competing
writers): stale-token pre-check with embedded currentState, DB-level
lost race reloading the winner's values, 422 token codes, version
bump on success, bulk-update proposal-token guard, line-item create
bumping the aggregate, audit rows never persisted on a lost race.
- GlobalExceptionHandlerTests: pin both SHOC 409 envelopes verbatim
(guarded { message, currentState } incl. null state; fallback
{ status, message, code }) and assert shape exclusivity.
- RowVersionCodecTests: round-trip, SHOC-style token literal,
malformed/wrong-length rejection.
- Existing suites threaded with live version tokens (Ver helper);
audit assertions moved from LogAsync to Stage.
187 xUnit green (was 166).
