Adopt designed front matter: typed, with staleness on plans
Replaces `type: default` — one value across every document, read by nothing. Types are now reference, guidelines, plan and report; plans carry status and updated, reports carry date. Convention documented in project-yukart REPOS.md. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013kj58Jugkic783b8ZrtTVZ
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