feat(ralph): smart gates + DAG + dashboard live (W3)

Restructurare Ralph QC loop pe smart gate dispatcher tag-driven (în loc de
5 faze fixe), DAG dependsOn cu propagare blocked, retry guard 3-strike, rate
limit detection, plus dashboard live cu polling 5s.

Changes:
- tools/ralph_prd_generator.py: parametru optional final_plan_path; când e
  furnizat, invocă Claude Opus pe final-plan.md pentru extragere user stories
  cu schema extinsă (tags, dependsOn, acceptanceCriteria 3-5). Backward compat
  păstrat — fără final_plan_path, fallback la heuristic-ul vechi.
- tools/ralph/prd-template.json: schema W3 (tags[], dependsOn[], retries,
  failed, blocked, failureReason, requiresDesignReview).
- tools/ralph/prompt.md: 4 faze (impl, base quality, smart gates, commit) +
  dispatcher pe story.tags. Tags vide → run-all-gates fallback (safe default).
- tools/ralph_dag.py (nou): tag validation heuristic anti-silent-regression
  (force ui dacă diff atinge .vue/.tsx/.html/.css/.scss; force db pentru
  migrations sau .sql; force vercel dacă există vercel.json) + topological
  sort cu blocked propagation + atomic prd.json updates.
- tools/ralph/ralph.sh: --max-turns 30, DAG-aware story selection, retry
  counter cu auto-fail la 3, rate limit detection (sleep 30min + 1 retry),
  CLI subcommands prin tools/ralph_dag.py helper.
- dashboard/handlers/ralph.py (nou): /api/ralph/status + /<slug>/log + /prd
  + /stop. Defensive vs corrupt prd.json. Sandbox-ed PID kill.
- dashboard/ralph.html (nou): live cards 3/2/1 col responsive, polling 5s,
  drawer pentru log/PRD viewer, status colors (--status-running/blocked/
  failed/complete declarate inline), Lucide icons cu aria-labels.
- dashboard/api.py: mount /api/ralph/* (GET status/log/prd, POST stop).
- tests/: 72 teste noi (smart gates, DAG, retry, dashboard endpoint).

Note arhitecturale:
- Polling 5s ales peste SSE/WebSocket (suficient pentru iter Ralph 8-15min)
- Tag validation rulează POST-iter pe diff git pentru anti-silent-regression
- Rate limit retry: 1 dată per rulare, apoi mark failed=rate_limited

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dashboard/api.py

@@ -40,6 +40,7 @@ from handlers.files import FilesHandlers  # noqa: E402
 from handlers.git import GitHandlers  # noqa: E402
 from handlers.habits import HabitsHandlers  # noqa: E402
 from handlers.pdf import PDFHandlers  # noqa: E402
+from handlers.ralph import RalphHandlers  # noqa: E402
 from handlers.workspace import WorkspaceHandlers  # noqa: E402
 from handlers.youtube import YoutubeHandlers  # noqa: E402
 
@@ -95,6 +96,7 @@ class TaskBoardHandler(
     PDFHandlers,
     YoutubeHandlers,
     WorkspaceHandlers,
+    RalphHandlers,
     CronHandlers,
     SimpleHTTPRequestHandler,
 ):
@@ -155,6 +157,23 @@ class TaskBoardHandler(
             self.handle_eco_logs()
         elif self.path == '/api/eco/doctor':
             self.handle_eco_doctor()
+        elif self.path == '/api/ralph/status' or self.path.startswith('/api/ralph/status?'):
+            self.handle_ralph_status()
+        elif self.path.startswith('/api/ralph/'):
+            # /api/ralph/<slug>/log or /api/ralph/<slug>/prd
+            parts = self.path.split('?', 1)[0].split('/')
+            # parts: ['', 'api', 'ralph', '<slug>', '<action>']
+            if len(parts) >= 5:
+                slug = parts[3]
+                action = parts[4]
+                if action == 'log':
+                    self.handle_ralph_log(slug)
+                elif action == 'prd':
+                    self.handle_ralph_prd(slug)
+                else:
+                    self.send_error(404)
+            else:
+                self.send_error(404)
         elif self.path.startswith('/api/'):
             self.send_error(404)
         else:
@@ -214,6 +233,13 @@ class TaskBoardHandler(
             self.handle_eco_git_commit()
         elif self.path == '/api/eco/restart-taskboard':
             self.handle_eco_restart_taskboard()
+        elif self.path.startswith('/api/ralph/') and self.path.endswith('/stop'):
+            parts = self.path.split('?', 1)[0].split('/')
+            if len(parts) >= 5:
+                slug = parts[3]
+                self.handle_ralph_stop(slug)
+            else:
+                self.send_error(404)
         else:
             self.send_error(404)