Security: add detect-secrets scan

.detect-secrets.cfg

@@ -0,0 +1,26 @@
+# detect-secrets exclusion patterns (regex)
+#
+# Note: detect-secrets does not read this file by default. If you want these
+# applied, wire them into your scan command (e.g. translate to --exclude-files
+# / --exclude-lines) or into a baseline's filters_used.
+
+[exclude-files]
+# pnpm lockfiles contain lots of high-entropy package integrity blobs.
+pattern = (^|/)pnpm-lock\.yaml$
+
+[exclude-lines]
+# Fastlane checks for private key marker; not a real key.
+pattern = key_content\.include\?\("BEGIN PRIVATE KEY"\)
+# UI label string for Anthropic auth mode.
+pattern = case \.apiKeyEnv: "API key \(env var\)"
+# CodingKeys mapping uses apiKey literal.
+pattern = case apikey = "apiKey"
+# Schema labels referencing password fields (not actual secrets).
+pattern = "gateway\.remote\.password"
+pattern = "gateway\.auth\.password"
+# Schema label for talk API key (label text only).
+pattern = "talk\.apiKey"
+# checking for typeof is not something we care about.
+pattern = === "string"
+# specific optional-chaining password check that didn't match the line above.
+pattern = typeof remote\?\.password === "string"