docs: correct audit-fixture CI-run claim (Copilot review)

Author: johanrd

tests/audit/alt-text/peer-parity.js

@@ -1,4 +1,12 @@
-// Audit fixture — peer-plugin parity for `ember/template-require-valid-alt-text`.
+// Audit fixture — translates peer-plugin test cases into assertions against
+// our rule (`ember/template-require-valid-alt-text`). Runs as part of the
+// default Vitest suite (via the `tests/**/*.js` include glob) and serves
+// double-duty: (1) auditable record of peer-parity divergences,
+// (2) regression coverage pinning CURRENT behavior. Each case encodes what
+// OUR rule does today; divergences from upstream plugins are annotated as
+// `DIVERGENCE —`. Peer-only constructs that can't be translated to Ember
+// templates (JSX spread props, Vue v-bind, Angular `$event`, undefined-handler
+// expression analysis) are marked `AUDIT-SKIP`.
 // See docs/audit-a11y-behavior.md for the summary of divergences.
 //
 // Source files: