docs: qualify plan-mode timing and workspace no-write claims

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.

docs/subsystems/telemetry.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/subsystems/telemetry.md
-telemetry.md: 92235a26fe278dfd6ac2b2ea5703b5c0d837b336
-telemetry.zh.md: e076abd90bd5054ddbfd6fbe7b725ee45d50a038
+telemetry.md: cf570723650c32f048ee797923a58f09c777455d
+telemetry.zh.md: 1bcaa86264e3afd741d66d6ee718946e6151496f