feat(controller): expose instance-level fleet identity and health snapshots
Add a pure fleet snapshot assessor and a read-only controller/reconciler MCP tool so multi-instance fleets can be enumerated by client_instance_id without treating shared client_type as duplication. Trusted launcher instance IDs, classification (missing/unmanifested/collisions/historical), registry schema extensions, docs, and regression tests for #978. Closes #978 Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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