Add .gitignore to keep secrets out of repo (values live in Bitwarden)

.gitignore

@@ -0,0 +1,21 @@
+# Secrets — real values live in Bitwarden, never committed.
+# Reference files (key-name tables) are fine; value-bearing files are not.
+
+# Credential value files
+credentials.env
+*.creds
+*.secret
+*.secrets
+secrets.*
+.env
+.env.*
+!.env.example
+
+# Loose password / key files
+pw.txt
+password*.txt
+*.pem
+*.key
+id_rsa
+id_ed25519
+*token*.txt