I3.2 — Documentation & runbook updates

[nickna]

Phase 3 · Size S · Risk: low

Scope

• Update CLAUDE.md (event-driven section), docs/architecture messaging docs, deployment/runbooks.
• Record the decision in project memory.

Acceptance criteria

• Docs reflect Wolverine/Postgres; no stale RabbitMQ/MassTransit guidance.

Dependencies

I3.1.

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Part of #909 — Messaging Migration epic.