docs: purge chain-of-thought leakage from prose

Delete design-session citations (decision/audit/plan ordinals, stack
positions), change narration, review choreography, and reviewer-addressed
justification from comments, JSDoc, docs, READMEs, Agent Notes, tests, and
generator templates; restate every affected fact as current-state contract
prose. Fix generated docs at their sources and regenerate the catalogs and
cordis-surface regions; re-paste type-equiv blocks; update every bilingual
counterpart and re-record the pairs. Record the citation rule in the
committed-artifact-citations Agent Note.

packages/client/ui-conversation/src/client/chat/ChatView.tsx

@@ -180,7 +180,7 @@ export function ChatView({
   const lastKeyRef = useRef<string | null>(null)
   const lastSteeringIdRef = useRef<string | null>(null)
   /** Flow tip signature — follow-scroll only when this moves, never on a
-   *  scroll-driven at-bottom chrome re-render (that was snapping inertial
+   *  scroll-driven at-bottom chrome re-render (which would snap inertial
    *  scrolls the rest of the way to the floor). */
   const followSigRef = useRef<string | null>(null)