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docs(plan): correct four epics' paths that no longer resolve master

A moved template gets its new path. A removed crate or page, and a file in another repository, are named without one. Each leaves the baseline. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Change-Id: I910da3e6eb03e441784fb99f855b78b9863ab038