feat(docs): convert spec-target file links to id form

All 13 file:docs/specs/ links lived in todo.org. Eleven converted directly. The two carrying a Review-findings search target now point at a new :ID: minted on that heading, since the id index scans whole files and heading-level ids stay rename-safe. The residue grep is zero and every id resolves to its target's :ID:.

The commit also carries the routine archive sweep of freshly-closed tasks and the speedrun pre-flight answer stamps.

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