chore: commit pending changes from session

- Add permission rules to .claude/settings.json
- Document empty merge and direct-to-master problems in problems.md
- Fix agent stream URL to use vite proxy instead of hardcoded host
- Add /agents proxy config to vite.config.ts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/settings.json

@@ -60,7 +60,16 @@
       "Edit",
       "Write",
       "Bash(find *)",
-      "Bash(sqlite3 *)"
+      "Bash(sqlite3 *)",
+      "Bash(cat <<:*)",
+      "Bash(cat <<'ENDJSON:*)",
+      "Bash(make release:*)",
+      "Bash(npm test:*)",
+      "Bash(head *)",
+      "Bash(tail *)",
+      "Bash(wc *)",
+      "Bash(npx vite:*)",
+      "Bash(npm run dev:*)"
     ]
   }
 }