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/session/session-telemetry/src/index.ts

@@ -111,7 +111,7 @@ export interface TelemetryBackend {
    * leave this unimplemented and let their SDK's own batching cadence govern
    * export timing: a backend that does implement it owns the interaction
    * between its concurrent flushes and {@link shutdown}'s drain (the OTel
-   * backend removed its implementation for exactly that hazard — see the
+   * backend leaves it unimplemented for exactly that hazard — see the
    * revival Agent Note).
    */
   flush?(): void