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.

.agents/notes/implemented/architecture/2026-06-11-runtime-arg-validation.md

@@ -18,7 +18,7 @@ The validator and compiler therefore share exact semantics: the implicit paramet
 
 - The model gets actionable feedback on its own malformed calls instead of an opaque crash, closing the gap between `InferArgs`'s promise and runtime reality.
 - The validator and `InferArgs` must stay in agreement; [a property test](../testing/2026-06-11-property-based-testing.md) generates args satisfying a spec and asserts they pass `validateArgs` (with targeted corruptions rejected), closing that drift risk mechanically.
-- `ToolArgsError` is a plain `Error` with a `code` field for now; if a harness-wide error taxonomy lands it becomes a subclass without changing callers that read `.message`.
+- `ToolArgsError` subclasses `HarnessError` from the [structured error taxonomy](2026-06-11-structured-error-taxonomy.md), keeping its `code` field; callers that read `.message` are unaffected by the hierarchy.
 - Validation cost is negligible next to a model call.
 
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