Move ROADMAP_COMPLETION_AUDIT.md, TASKS_TO_COMPLETE.md,
gigafactory-phase3-progress.md and FLEET_CONTROL_PLANE.md under
docs/gigafactory/ so the scattered Gigafactory docs are easy to discover.
Update intra-doc and cross-repo source-of-truth references (fleet README
and types.ts comment) to the new agent-queue/docs/gigafactory/ path.
Pure docs/comment move; no behavior change.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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