fix(a2a): update extension URIs to proto-labs.ai domain

[mabry1985]

Summary

• Swap protolabs.ai → proto-labs.ai on the effect-domain-v1 and cost-v1 extension URIs in Quinn's agent card.
• Update matching test assertions.

Why

Workstacean moved to proto-labs.ai (protoWorkstacean#407). Until Quinn's card declares the same domain, SkillBrokerPlugin can't match Quinn's declarations against the registry — extension metadata stamping silently degrades to no-op. Not a crash, but effect-domain-v1 stops feeding the L1 planner and cost-v1 stops feeding the cost interceptor.

Closes

#60

Test plan

• tests/test_a2a_integration.py — all 10 pass locally

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 53d06177-b2ca-4f88-973e-b16f5c7b16c4

📥 Commits

Reviewing files that changed from the base of the PR and between 582216c and a2e12e4.

📒 Files selected for processing (2)

• server.py
• tests/test_a2a_integration.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/extension-uris-proto-labs-domain

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