test: validate broker adapters against Docker services

[CoreyLeath-code]

Summary

Adds Docker-backed, real-broker round-trip tests for the existing Kafka, Redis Streams, and RabbitMQ adapter modules, and fixes the two Redis production defects exposed by that validation: an obsolete client import and the stream-blocking argument.

Files changed

• redis_bus.py — replaces incompatible aioredis use with the already-declared redis.asyncio client, creates the client synchronously, uses the supported block argument for xread, and closes it with aclose().
• tests/integration/docker-compose.yml — isolated Kafka, Redis, and RabbitMQ services used only by integration tests; Kafka is configured for one-node consumer-group startup.
• tests/integration/test_broker_adapters.py — one @pytest.mark.integration round trip per existing adapter.
• requirements-dev.txt — retains test-only Kafka/RabbitMQ clients and removes the incompatible legacy aioredis package.
• pyproject.toml — registers the integration marker and makes the default suite exclude it, preserving a Docker-free unit path.
• .github/workflows/ci.yml — adds a dedicated pytest -m integration job with Docker startup and always-on teardown.
• README.md — records the verified adapter-validation status.

Brokers and verified test result

Broker	Adapter	Result
Kafka	kafka_bus.py	Passed real publish/consume round trip
Redis	redis_bus.py	Passed real publish/consume round trip after the production API fix
RabbitMQ	rabbitmq_bus.py	Passed real publish/consume round trip

Validation performed

• CI run 144: fast formatting, lint, type, Docker Compose validation, unit test, benchmark, and JSON-validation checks all passed.
• Dedicated broker job: pytest -m integration selected all three adapter tests and passed: 3 passed, 16 deselected in 3.56s.
• The deselected tests are the normal Docker-free unit suite; no integration check was skipped.

Risks

• Broker containers add duration to the dedicated integration job only.
• The test environment uses versioned container tags; adopting digest pinning would further improve supply-chain repeatability.

Follow-up recommendations

• Make the dedicated broker job a required merge check once the branch-protection policy is updated.
• Add explicit reconnection and broker-unavailability behavior tests as a separate resilience-focused change.

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📥 Commits

Reviewing files that changed from the base of the PR and between f122f4f and b8ba1ee.

📒 Files selected for processing (7)

• .github/workflows/ci.yml
• README.md
• pyproject.toml
• redis_bus.py
• requirements-dev.txt
• tests/integration/docker-compose.yml
• tests/integration/test_broker_adapters.py

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