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/agent_v1/network/streamer.py

@@ -30,6 +30,7 @@ import os
 import queue
 import threading
 import time
+from typing import Callable, Optional
 
 import requests
 from PIL import Image
@@ -95,6 +96,11 @@ class TraceStreamer:
         # Initialisé paresseusement pour ne pas payer le coût SQLite en dehors
         # d'un streaming actif.
         self._buffer: PersistentBuffer | None = None
+        self._on_finalize_result: Optional[Callable[[dict], None]] = None
+
+    def set_on_finalize_result(self, callback: Optional[Callable[[dict], None]]) -> None:
+        """Définir un callback appelé avec le payload JSON de /finalize."""
+        self._on_finalize_result = callback
 
     def _get_buffer(self) -> PersistentBuffer:
         """Retourne le buffer persistant, en l'initialisant au besoin."""
@@ -621,6 +627,14 @@ class TraceStreamer:
             if resp.ok:
                 result = resp.json()
                 logger.info(f"Session finalisée: {result}")
+                if self._on_finalize_result is not None:
+                    try:
+                        self._on_finalize_result(result)
+                    except Exception as cb_error:
+                        logger.warning(
+                            "Callback finalize ignoré après erreur: %s",
+                            cb_error,
+                        )
             else:
                 logger.warning(f"Finalisation échouée: {resp.status_code}")
         except Exception as e: