ds-review-bot round 3:
- set() after a turn's final step lands in a later turn (selection
never forces continuation) — the same-turn phrasing overstated the
guarantee; set() JSDoc + subsystem page (both languages).
- Workspace attach/insert/detach no-op claims now carry the
filtered-candidate-prune caveat: mutate() durably prunes stale
candidates even when the requested change is a no-op, a state the
sessionIds contract explicitly permits; Workspace fence re-synced on
both page sides; catalogs regenerated.
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