chore: consolidate documentation and clean repository

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -9,17 +9,9 @@ playwright.config.d.ts
 .env.*
 public/version.json
 npm-debug.log*
-input_info/extracted/
-agent/state/
-agent/reports/
-docs/HARDWARE_BROWSER_BENCHMARK_LATEST.md
-.agent/worktrees/
-.demo-preview.pid
-.demo-preview.log
 test-results/
 playwright-report/
 blob-report/
-releases/backup-*/
-scripts/.perf-tmp.cjs
-tools/stage2-cad/out/
+.demo-preview.pid
+.demo-preview.log
 __pycache__