x07-messaging-rr-lab

Reference implementation for Prompt 9 in docs/agent/readiness-checks.md.

• Prompt: PROMPT.md
• Hydrate deps: x07 pkg lock --project x07.json
• Run (record): x07 run --profile os_record --allow-host 127.0.0.1:9092 -- <args...> (Kafka) or --allow-host 127.0.0.1:5672 (AMQP)
• Run (replay): x07 run --profile rr_replay --fixture-rr-dir .x07_rr -- <args...>
• Contracts check: x07 arch check --write-lock
• Tests: x07 test --manifest tests/tests.json (replay only)