fix(gitleaks): estate baseline — a documentation filename is not a secret

config/gitleaks/estate-baseline.toml

@@ -211,4 +211,15 @@ regexes = [
   # Haskell declaration `data Ed25519KeyPair = Ed25519KeyPair`. A bare
   # CamelCase identifier with no digits or separators is a type, not a key.
   '''^(Ed25519|X25519|Curve25519|RSA|ECDSA|EdDSA|Secp256k1)[A-Za-z]*$''',
+
+  # --- document references -------------------------------------------------
+  # A single documentation FILENAME captured as a record's value. Shape (kept
+  # described, not shown, per the rule at the top of this list): a prose record
+  # whose KEY contains an `auth`-like keyword (e.g. an "authoritative text"
+  # field) and whose quoted VALUE starts with a doc filename, so
+  # `generic-api-key` captures the filename as the secret. Found in a
+  # machine-readable STATE record, echo-types#329 (PR #331), 2026-09-30.
+  # True for every repository: no credential format ends in `.adoc` or `.md`,
+  # and the class admits no `/`, so it names one file, never a path or a blob.
+  '''^[A-Za-z0-9][A-Za-z0-9._-]*\.(adoc|md)$''',
 ]