feat: ship production deploy, Playwright e2e, and agent implementer

Add Docker atomic deploy tooling, CI, Playwright smoke/visual suite,
shared industrial theme, physics invariants, quality-mode wiring,
and a worktree-isolated agent implementer MVP with hard safety limits.

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

.gitignore

@@ -3,11 +3,19 @@ dist/
 *.tsbuildinfo
 vite.config.js
 vite.config.d.ts
+playwright.config.js
+playwright.config.d.ts
 .env
 .env.*
 npm-debug.log*
 input_info/extracted/
 agent/state/
 agent/reports/
+.agent/worktrees/
 .demo-preview.pid
 .demo-preview.log
+test-results/
+playwright-report/
+blob-report/
+releases/backup-*/
+scripts/.perf-tmp.cjs