chore: keep issue-tracker identifiers out of the repository

AGENTS.md

@@ -79,6 +79,8 @@
 - Keep real-system validation evidence in its approved private tracking location. Do not paste that
   evidence into source, tests, documentation, generated skills, benchmarks, commit metadata, pull
   requests, or CI output.
+- Never put private issue-tracker identifiers (for example `ABC-123`) in commits, branch names, pull
+  request titles or bodies, code, comments, tests, or documentation. Describe the change instead.
 - Load and follow the `public-repository-hygiene` skill before editing or publishing this repository.
   Run its private scanner over the working tree and introduced history before every push, and
   rescan after generation, formatting, rebasing, or merging.

tests/unit/src/sqlbuild/rule_engine/_helpers/host/helpers.py

@@ -322,7 +322,7 @@ def changed_codes(self) -> tuple[str, ...]: ...
 
 
 class ReferenceStateDetector:
-    """The detector before CHI-491: re-fingerprint every remaining code after each call."""
+    """The previous detector: re-fingerprint every remaining code after each call."""
 
     def __init__(
         self, *, namespaces: dict[str, tuple[dict[str, object], ...]], rules_root: Path