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Establish Fleet workstream doctrine under mvp-20260312: north star (incl. fleet-as-means-of-production), Phase-2 observability PRD, workstream tasks, and scratchpad. Collision-safe: scoped to docs/fleet/, touches none of the MVP single-writer control-plane files. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RMoEx7hfdFGjUiCHuN1RRi