Why: Account disable could be followed by late Backend business writes, API key creation could implicitly create users, account bootstrap locks could invert, and directory cursors were process-local or leaked out-of-scope changes.
Evidence: Local go test ./... and isolated PostgreSQL package suites passed on the staged candidate; exact committed-head SELF replay and stage 6 human review remain pending.
Impact: Adds final account transactions and external-effect checks across HTTP, Host, Bus and run manager; tightens API key issuance and persists versioned cursor signing. Delegated RDM rename still needs the separately proposed real-operator contract, so A1 and stage 6 are not complete.
Refs: Documents U3 r1, approved A1-A4 amendment fb3a821, pending delegated-projection amendment 5783940, Dev feature/iam-u3-account-directory-recovery.
Why: plan U5 remainder (KTD5/KTD9 + exit criteria) - commands must commit atomically with business writes, artifacts need a shared object store for multi-instance, and the two-real-process acceptance matrix must run in CI.
Evidence: full suite green on SQLite and real PostgreSQL 18.6 (35 packages each tier) - outbox tx test (rollback removes the command, commit makes both visible, idempotent re-enqueue), S3 store tests (SigV4-signed round trip, 404 sentinel, idempotent delete, presigned GET, env fallback), real-process acceptance (testbinary self-spawn of two serve processes with per-process identity and command consumers against one schema: same-conversation contention, cross-instance cancel command claimed exactly once, stale-owner settle fenced with run unchanged).
Impact: EnqueueCommandInTx for in-transaction command outbox and AppendEvents now notifies in the same transaction (KTD6 front half); blobstore.S3 (SigV4, presign, prefix isolation) injected from BLOBSTORE_S3_* env when configured, local fallback otherwise; realproc_test provides the process-level multi-instance acceptance gate (PG-env gated, runs in CI test-pg job).
Refs: proposals/2026-10-11-collaboration-storage-and-distribution.md U5 KTD5/KTD9, section 5 exit criteria; R4/R7/R10.
Why: plan U5/KTD4+KTD5 - before a second instance may serve writes, conversation execution must have a single valid owner (DB lease, epoch increments on takeover), stale owners must not settle (in-transaction fence check), and cancel/HITL must reach the executing instance via a persistent command inbox.
Evidence: full suite green twice-relevant on SQLite and real PostgreSQL 18.6 (35 packages each tier) - lease tests (claim/contention/re-claim/renew fencing/expiry takeover/monotonic epoch, command inbox idempotent enqueue, atomic concurrent claim) and multi-instance tests (same-conversation contention rejected, stale-owner settle fenced with run unchanged, cross-instance cancel consumed exactly once by the owner instance, non-owner does not consume).
Impact: v23 migration (conversation_executions + run_commands); ClaimConversation stacks a DB lease on PG tiers (15min, release on conversation release); settle path fenced (fenced runs emit run.fenced, no terminal write); StartCommandConsumer polls the inbox for commands on locally-owned executions (cancel routes to local cascade or DB-level close-out; HITL revalidates gate and rejects expired explicitly); server cancel/HITL fall back to command enqueue with 202 when the run is not local; app wires instance identity (host:addr on PG tiers) and starts the consumer.
Refs: proposals/2026-10-11-collaboration-storage-and-distribution.md U5 KTD4/KTD5; R4/R10.
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