Update punch-list spec: correct the recurrence diagnosis, record progress

The spec described skipped recurrences as an accidental "double-book."
It isn't: generating the successor regardless of completion is deliberate
(so skipping doesn't stall the series). The actual defect was that
nothing retired the superseded occurrence, so skips accumulated as
permanent overdue items. Recorded the intended semantics -- an occurrence
not done before its successor lands is stale, and the newer one stands.

Also marked the bucket pool as populated and flagged the leftover
duplicate "Yard work" recurring task as needing an explicit decision,
since deleting it ends its series.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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