feat: add raven stub, state tracking, sam-research + searxng monitoring
- RAVEN_URL env var: sends down/recovery alerts when Raven is live (silent no-op until then) - service-states.json persists prev state for change detection - config.yaml: adds sam-research + searxng services, adds sam/citadel/varys agents Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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