Update README with performance and security details

Added performance metrics and security features to README.

README.md

@@ -76,6 +76,13 @@ ChronoSeal is a cost-raising attestation layer. It is not a CAPTCHA replacement,
 - WASM and hashing panic-resistance safeguards.
 - Progressive Web App (PWA) assets including favicon and web manifest support.
 
+✅ ~9 MiB native daemon
+✅ ~728 KiB WASM runtime
+✅ Full RELRO
+✅ PIE enabled
+✅ Stack canaries
+✅ NX enabled
+
 ## How It Works
 
 ChronoSeal creates a short-lived browser attestation session and advances it through signed heartbeats.