fix: make packaged updates certificate-free

docs/SECURITY.md

@@ -108,9 +108,9 @@ included model uses:
 - atomic non-secret status JSON;
 - previous-SHA recording and non-zero failure exits.
 
-## Remaining release hardening
+## Optional and future release hardening
 
-- code-sign packages and signed updates;
+- optional code signing if ForgeFlow is ever distributed publicly;
 - validate private CA/TLS behavior in the target network;
 - dependency, secret and binary scans in CI;
 - package-level IPC/navigation regression tests;