docs(spec-review): enumerate implementation tasks in Phase 6

From a pearl handoff: Phase 6 logged deferred and v1 work only in passing, so the implementer handoff was a re-read of the spec rather than a paste. I added a step that lifts the spec's Implementation phases section into a drop-in todo.org block: one [#B] TODO per phase plus a test-surface entry mirroring the Acceptance criteria. A spec with no phase decomposition fails the step, surfacing the shape problem as a finding before Ready rather than inventing phases. Added Exit Criterion 6 and a review-history entry.

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