feat: QA test suite (12 stages, 205 tests) + Chrome DevTools MCP config

- Add tests/ directory with 12 bash/curl/jq test stages covering all API endpoints
- Add tests/lib/common.sh shared library with assertions and helpers
- Add tests/run-all.sh orchestrator script
- Update CLAUDE.md with test data reference and DevTools MCP docs
- Increase dev rate limit to 5000 for test suite runs
- Configure Chrome DevTools MCP in project settings

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/settings.json

@@ -4,10 +4,22 @@
       "type": "http",
       "url": "https://mcp.figma.com/mcp"
     },
-    "chrome-devtools": {
+    "devtools": {
       "type": "stdio",
-      "command": "npx",
-      "args": ["-y", "chrome-devtools-mcp@latest", "--no-usage-statistics", "--isolated"]
+      "command": "/opt/homebrew/bin/chrome-devtools-mcp",
+      "args": [
+        "--no-usage-statistics",
+        "--no-performance-crux",
+        "--isolated",
+        "--chromeArg=--user-data-dir=/tmp/chrome-mcp-profile",
+        "--chromeArg=--no-first-run",
+        "--chromeArg=--disable-background-networking",
+        "--chromeArg=--disable-sync",
+        "--chromeArg=--disable-translate"
+      ],
+      "env": {
+        "CHROME_DEVTOOLS_MCP_NO_USAGE_STATISTICS": "1"
+      }
     }
   }
 }