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Execute, review, or supervise one Picea physics-engine milestone under the repository milestone gates. Use when the user asks to implement, continue, validate, review, or strictly stop at a named Picea milestone, or when work must follow the docs/plans/2026-04-25-picea-physics-engine-production-milestones.md boundary, test-first behavior locks, and supervisor acceptance flow.

Maintain Picea repository AI navigation and routing documents. Use when Codex needs to create or update AGENTS.md, docs/ai/index.md, docs/ai/repo-map.md, docs/ai/doc-catalog.yaml, docs/ai/skill-candidates.md, or repository-local skills after module layout, milestone scope, validation commands, or documentation authority changes.