feat(agency): add session protocols to agents and memory field to schema
- 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>
Bernd Worsch
260b9b27e9