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.

.github/issue-management/policy.mjs

@@ -20,7 +20,7 @@ const PR_KINDS = new Set([
   'kind/cleanup',
   'kind/dependency',
 ])
-// Aliases removed by the unified taxonomy migration remain reserved so they cannot be recreated.
+// Retired label aliases stay reserved so they cannot be recreated.
 const LEGACY_LABELS = new Set([
   'kind/bug',
   'kind/documentation',