snapshot: WIP 5j replay reliability (B1 watchdog + dialog handlers + grounding drift)

Snapshot avant correction du blocage relance Léa (3 incidents 24h: SSH refusé,
polls morts ×2). Point de rollback stable.

Contenu:
- agent_v1/core/executor.py: 5 patchs dialog handling (saveas drift, close_tab
  hotkey fallback, confirm_save Unicode apostrophe, foreground dialog
  recontextualization, runtime_dialog in-loop) + helpers normalize_window_hint,
  requires_post_verify_window_transition
- agent_v1/core/grounding.py: garde drift template fix (fallback_x/y plumbed)
- server_v1/replay_watchdog.py (NEW): orphan watchdog B1, scan 10s timeout 30s
- server_v1/api_stream.py: dispatched_action plumbing, watchdog lifespan,
  metrics endpoint
- server_v1/replay_engine.py: _schedule_retry préserve original_action +
  dispatched_action
- stream_processor.py: gardes _infer_tab_switch_target (no false switch_tab
  on save_as dialog open) + _attach_expected_window_before
- tests/integration: test_replay_watchdog.py (8 cas), test_stream_processor.py
- tests/unit: test_executor_verify_window_guard.py (start_button, close_tab,
  runtime_dialog, post_verify, transition fallbacks)

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

agent_v0/lea_ui/server_client.py

@@ -338,6 +338,50 @@ class LeaServerClient:
         except Exception:
             return None
 
+    def resume_replay(self, replay_id: str) -> bool:
+        """Reprendre un replay en pause supervisée via HTTP direct.
+
+        Fallback du chemin SocketIO (`lea:replay_resume` → agent_chat)
+        utilisé quand le bus feedback est déconnecté au moment où
+        l'utilisateur clique « Continuer » dans la bulle paused.
+
+        Retourne True si le serveur streaming a accepté la reprise.
+        """
+        if not replay_id:
+            return False
+        try:
+            import requests
+            resp = requests.post(
+                f"{self._stream_url}/traces/stream/replay/{replay_id}/resume",
+                headers=self._auth_headers(),
+                timeout=10,
+            )
+            return bool(resp.ok)
+        except Exception:
+            logger.debug("resume_replay HTTP silenced", exc_info=True)
+            return False
+
+    def abort_replay(self, replay_id: str) -> bool:
+        """Annuler un replay en pause supervisée via HTTP direct.
+
+        Symétrique de ``resume_replay`` : fallback du chemin SocketIO
+        (`lea:replay_abort`) quand le bus feedback est déconnecté.
+        POSTe sur ``/replay/{id}/cancel`` côté serveur streaming.
+        """
+        if not replay_id:
+            return False
+        try:
+            import requests
+            resp = requests.post(
+                f"{self._stream_url}/traces/stream/replay/{replay_id}/cancel",
+                headers=self._auth_headers(),
+                timeout=10,
+            )
+            return bool(resp.ok)
+        except Exception:
+            logger.debug("abort_replay HTTP silenced", exc_info=True)
+            return False
+
     def report_action_result(
         self,
         session_id: str,