promote: staging -> main (bug fixes v0.2.1)

[mabry1985]

Summary

Ship v0.2.0 bug fixes to main:

• Agent card does not advertise bearer scheme when A2A_AUTH_TOKEN is set #14 Agent card bearer scheme advertisement
• MemoryMiddleware.on_session_end is never invoked - memory persistence dead on arrival #15 Session memory persistence now actually fires
• Fix pytest collection errors #17 Test suite collects in fresh Docker env
• fix(memory): decouple MemoryMiddleware from knowledge_store #18 MemoryMiddleware activates with memory: true alone

Post-merge prepare-release.yml will bump to v0.2.1.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: f9f30f2b-6906-4c49-b5be-31876cef695b

📥 Commits

Reviewing files that changed from the base of the PR and between f14b2fd and 305756e.

📒 Files selected for processing (9)

• .github/workflows/docker-publish.yml
• graph/agent.py
• graph/middleware/memory.py
• pyproject.toml
• requirements.txt
• server.py
• tests/conftest.py
• tests/test_a2a_integration.py
• tests/test_memory_persistence.py

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch staging

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