docs(commands): add stale-entry and privacy pre-write checks to codify

codify now runs two mandatory checks before writing a CLAUDE.md entry: a stale-entry scan (update or remove a no-longer-true entry in place rather than appending a contradiction around it) and a privacy check asking "safe if the project were public?" and "belongs in private memory instead?", routing private content to auto-memory. These are gates, not background guidance.

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