[AAASM-121] ✨ (mcp): Implement ClientSession universal governance interception

[Chisanan232]

Description

Implement the MCP ClientSession.call_tool runtime adapter as the universal cross-framework fallback interception layer.

This PR adds:

• Idempotent async monkey patching for mcp.ClientSession.call_tool
• MCPToolBlockedError for DENY/PENDING-reject governance outcomes
• Server identifier extraction across SSE, stdio, WebSocket, and transport metadata
• Async approval wait handling for PENDING decisions
• Truncated result audit recording (2000 chars)
• Unit and integration coverage for direct MCP usage and LangChain coexistence

Type of Change

• ✨ New feature
• 🔧 Bug fix
• ♻️ Refactoring
• 🍀 Performance improvement
• 📚 Documentation update
• 🚀 Release

Breaking Changes

Does this PR introduce any breaking changes?

• No
• Yes (please describe below)

Related Issues

• Related JIRA ticket: AAASM-121
• Related GitHub issues: N/A

Testing

Describe the testing performed for this PR:

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No tests required (explain why)

Commands run:

• uv run pytest

Result:

• 110 passed, 7 skipped

Checklist

• Code follows project style guidelines
• Self-review completed
• Comments added for complex logic
• Documentation updated if needed
• All tests passing

[codecov]

Codecov Report

❌ Patch coverage is 94.00000% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
agent_assembly/adapters/mcp/patch.py	93.75%	9 Missing ⚠️

📢 Thoughts on this report? Let us know!

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
94.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud