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>

.dockerignore

@@ -3,3 +3,13 @@ dist
 .git
 npm-debug.log
 .DS_Store
+.agent
+releases
+e2e
+playwright-report
+test-results
+agent/reports
+agent/state
+docs
+*.md
+.git