fix(lint-org): scope the todo-format checkers out of docs/specs/

The five todo-format-family checkers encode todo.org completion conventions, but they ran on every org file, so they misfired across docs/specs/. That was 100 findings over nine specs in this repo, and the same noise in every project carrying specs. A spec's Decisions section legitimately uses a level-2 DONE with no CLOSED cookie. Its review-history uses level-2 dated headings. Neither is a completion defect there.

A path guard now skips the family on any file under a docs/specs/ segment, the canonical spec home per the docs-lifecycle rule. Link, table, and structural checks still run on specs, so a broken link in one still flags. todo.org and every non-spec org file keep the full checker set.

Folds in task-missing-last-reviewed alongside the four named checkers, since it's the same family and misfires the same way on a spec's phase tasks. Correcting an earlier note in the task: these are lint-org.el's own checkers, not org-lint's, so the fix is a local guard rather than filtering upstream output.

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