feat(agent_v1): FeedbackBusClient — client SocketIO pour bus 'lea:*'

Consomme les events 'lea:*' émis par agent_chat (port 5004) et les dispatche
vers un callback fourni par ChatWindow (J3.3 à venir).

Caractéristiques :
- Connexion en thread daemon (non-bloquant pour la mainloop tkinter)
- Reconnect auto illimité (delay 2s → 30s exponentiel)
- Auth Bearer Token via header HTTP au handshake
- Fail-safe : connect échoué, callback qui raise, disconnect qui raise
  → tout silencieusement loggé, ChatWindow continue normalement

13 tests pytest verts (tests/integration/test_feedback_bus_client.py).
Pas de connexion réseau réelle dans les tests (python-socketio mocké).

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

tests/integration/test_feedback_bus_client.py

@@ -0,0 +1,125 @@
+"""Tests FeedbackBusClient (J3.2).
+
+On mock python-socketio pour ne pas ouvrir de vraie connexion réseau.
+Le test E2E réel (vraie connexion bus 5004) est différé à J4.3.
+"""
+
+from unittest.mock import patch
+
+import pytest
+
+from agent_v0.agent_v1.network.feedback_bus import FeedbackBusClient, LEA_EVENTS
+
+
+def test_init_creates_socketio_client():
+    bus = FeedbackBusClient("http://localhost:5004")
+    assert bus._sio is not None
+    assert bus.connected is False
+
+
+def test_init_strips_trailing_slash():
+    bus = FeedbackBusClient("http://localhost:5004/")
+    assert bus._url == "http://localhost:5004"
+
+
+def test_lea_events_registered():
+    bus = FeedbackBusClient("http://localhost:5004")
+    handlers = bus._sio.handlers.get('/', {})
+    for ev in LEA_EVENTS:
+        assert ev in handlers, f"Handler {ev!r} non enregistré sur le client"
+
+
+def test_dispatch_calls_callback():
+    received = []
+    bus = FeedbackBusClient(
+        "http://localhost:5004",
+        on_event=lambda e, p: received.append((e, p)),
+    )
+    bus._dispatch('lea:paused', {'workflow': 'demo', 'reason': 'incertain'})
+    assert received == [('lea:paused', {'workflow': 'demo', 'reason': 'incertain'})]
+
+
+def test_dispatch_handles_none_payload():
+    received = []
+    bus = FeedbackBusClient(
+        "http://localhost:5004",
+        on_event=lambda e, p: received.append((e, p)),
+    )
+    bus._dispatch('lea:done', None)
+    assert received == [('lea:done', {})]
+
+
+def test_dispatch_silenced_on_callback_error():
+    """Une exception dans le callback consommateur ne doit jamais remonter."""
+    def boom(event, payload):
+        raise RuntimeError("callback fail")
+    bus = FeedbackBusClient("http://localhost:5004", on_event=boom)
+    bus._dispatch('lea:paused', {})  # ne doit pas raise
+
+
+def test_default_callback_is_silent():
+    """Sans callback fourni, le dispatch ne casse pas."""
+    bus = FeedbackBusClient("http://localhost:5004")
+    bus._dispatch('lea:paused', {'x': 1})  # ne doit pas raise
+
+
+def test_token_in_authorization_header():
+    bus = FeedbackBusClient("http://localhost:5004", token="abc123")
+    captured = {}
+
+    def fake_connect(url, headers=None, **kwargs):
+        captured['headers'] = headers
+        raise RuntimeError("stop here")
+
+    with patch.object(bus._sio, 'connect', side_effect=fake_connect):
+        bus._run()
+
+    assert captured['headers']['Authorization'] == 'Bearer abc123'
+
+
+def test_no_token_means_no_auth_header():
+    bus = FeedbackBusClient("http://localhost:5004")
+    captured = {}
+
+    def fake_connect(url, headers=None, **kwargs):
+        captured['headers'] = headers
+        raise RuntimeError("stop here")
+
+    with patch.object(bus._sio, 'connect', side_effect=fake_connect):
+        bus._run()
+
+    assert 'Authorization' not in captured['headers']
+
+
+def test_run_silenced_on_connect_error():
+    """connect() qui raise ne doit pas faire crasher le thread."""
+    bus = FeedbackBusClient("http://localhost:5004")
+    with patch.object(bus._sio, 'connect', side_effect=ConnectionError("boom")):
+        bus._run()  # ne doit pas raise
+
+
+def test_start_is_idempotent():
+    """Un second start() pendant que le thread tourne ne doit pas en créer un autre."""
+    import threading
+    bus = FeedbackBusClient("http://localhost:5004")
+    block = threading.Event()
+    with patch.object(bus, '_run', side_effect=lambda: block.wait(timeout=2)):
+        bus.start()
+        first_thread = bus._thread
+        bus.start()
+        second_thread = bus._thread
+        block.set()
+    assert first_thread is second_thread, "start() doit être idempotent quand un thread tourne"
+
+
+def test_stop_when_not_connected_is_silent():
+    bus = FeedbackBusClient("http://localhost:5004")
+    bus.stop()  # ne doit pas raise même si jamais connecté
+
+
+def test_stop_silenced_on_disconnect_error():
+    bus = FeedbackBusClient("http://localhost:5004")
+    # Forcer connected=True sur l'instance et faire raise disconnect()
+    with patch.object(bus._sio, 'disconnect', side_effect=RuntimeError("boom")):
+        bus._sio.connected = True
+        bus.stop()  # ne doit pas raise