[AAASM-49] ✨ (adapters): Implement AdapterRegistry lifecycle

[Chisanan232]

Description

Implement AdapterRegistry for AAASM-49 with thread-safe adapter lifecycle and discovery flow:

• add AdapterInfo contract and AdapterRegistry state manager
• add built-in placeholder adapter pre-registration
• implement register, unregister, list_active, entry-point discovery, and auto_detect
• enforce idempotent detection and track activation/discovery error status
• export registry APIs and add strict mypy coverage for registry module
• add unit tests for importability isolation, third-party entry points, idempotency, real-time state reflection, and concurrent mutation safety

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-49
• Related GitHub issues: #XX

Testing

Describe the testing performed for this PR:

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

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 86.55462% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
agent_assembly/adapters/registry.py	86.32%	16 Missing ⚠️

📢 Thoughts on this report? Let us know!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
86.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud