- CONTRIBUTING.md: add Session Start/Close protocol reference with YAML frontmatter schema (including new memory: enabled|disabled field) - agents: add ## Session Start / ## Session Close blocks to project-management, tdd-workflow, requirements-engineering, scope-analyst - registry.py: add AgentCategory.META; add memory field to AgentDefinition (parsed from frontmatter, default None = enabled); add coach/meta keyword detection and sys-medic/medic to infrastructure detection WP-0002 T09, T10, T11 done. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>