chore: gitignore .wrangler/ session cache

wrangler writes pages.json + wrangler-account.json into a .wrangler/
directory next to whatever CWD it runs from. Stops stray session state
from showing up in git status when wrangler is run against the dash
or telemetry repos from this directory.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: claude

.gitignore

@@ -135,3 +135,6 @@ website/npm-debug.log*
 website/yarn-error.log*
 __pycache__/
 native/macos/MCPProxy/.build/
+
+# Wrangler session cache
+.wrangler/