ci: gitleaks allowlist for gov_token_policy IDs (Cardano script hashes, not secrets). Closes #300

.gitleaks.toml

@@ -0,0 +1,22 @@
+# gitleaks config — aldabra
+#
+# Why: the gitleaks `generic-api-key` rule flags high-entropy hex strings.
+# Cardano governance / policy / asset / script identifiers are 28-byte
+# blake2b hashes (56 hex chars), which trip the rule even though they are
+# public on-chain values — script hashes are derivable from validator
+# bytecode that ships in the repo. They are NOT secrets.
+#
+# Add new allowlist entries here when CI catches more false-positive
+# patterns. Real secrets (signing keys, mnemonics, API tokens) still
+# trip the rule because their syntactic context (Bech32 prefixes,
+# private_key fields, env-var names) doesn't match these regexes.
+
+[extend]
+useDefault = true
+
+[allowlist]
+description = "Cardano gov_token_policy / policy_id IDs are public blake2b script hashes"
+regexTarget = "line"
+regexes = [
+    '''gov_token_policy:\s*"[a-f0-9]{56}"''',
+]