fix(ai): frontend console error — remove broken tracker (agent)

- Remove `wss://open.video.lukewarlow.uk:443/announce` from `DEFAULT_WSS_TRACKERS` in `js/constants.js`.
- This tracker was returning `net::ERR_SSL_PROTOCOL_ERROR`, causing console noise and connection failures.
- Added `scripts/agent/debug_frontend.py` to help diagnose frontend initialization errors.

Verified with `scripts/agent/debug_frontend.py` that the error is resolved.
Ran `npm run format`, `npm run lint`, and `npm run test:unit`.

scripts/agent/debug_frontend.py

@@ -0,0 +1,29 @@
+from playwright.sync_api import sync_playwright
+import time
+import sys
+
+def run():
+    with sync_playwright() as p:
+        browser = p.chromium.launch()
+        page = browser.new_page()
+
+        print("--- Console Messages ---")
+        page.on("console", lambda msg: print(f"console:{msg.type}: {msg.text}"))
+
+        print("--- Page Errors ---")
+        page.on("pageerror", lambda exc: print(f"pageerror: {exc}"))
+
+        print("--- Failed Requests ---")
+        page.on("requestfailed", lambda req: print(f"requestfailed: {req.url} {req.failure}"))
+
+        try:
+            page.goto("http://localhost:8000")
+            # Wait for potential initialization errors
+            time.sleep(5)
+        except Exception as e:
+            print(f"Navigation failed: {e}")
+
+        browser.close()
+
+if __name__ == "__main__":
+    run()