Update README: add hero GIF, move demo video to Quick Start, gitignore registry tokens

Author: Sentinel-Gate

.gitignore

@@ -39,6 +39,9 @@ versioned/
 .env
 .env.*
 
+# MCP Registry tokens (local auth)
+.mcpregistry_*
+
 # E2E test secrets (GitHub token, API keys — NEVER commit)
 tests/e2e/.env.test
 tests/e2e/.env.secrets

README.md

@@ -20,7 +20,7 @@
 </p>
 
 <p align="center">
-  <video src="assets/sentinelgate-demo-final.mp4" width="720"></video>
+  <img src="assets/sentinelgate-demo.gif" width="720" alt="SentinelGate demo">
 </p>
 
 ---
@@ -116,6 +116,10 @@ $ sentinel-gate start
 
 Open **http://localhost:8080/admin** to manage policies, upstreams, and identities. The MCP endpoint is **http://localhost:8080/mcp** — configure your agent to connect there with an API key.
 
+<p align="center">
+  <video src="https://github.com/user-attachments/assets/2cb6864e-f00e-4b9e-9c39-b3523c77d50b" width="720" controls autoplay loop muted></video>
+</p>
+
 ---
 
 ## Playground