feat(navigation): brique login visuel OCR-ancre + action navigate au replay

- core/navigation/ : visual_verifier (presence=OCR, role=VLM ancre sur tokens),
  grounding (OCR-anchor first, VLM fallback, cache coords valide par la vue),
  visual_login (verify_before/after, DETTE-023), action_resolver (pont runtime)
- api_stream/replay_engine : dispatch action navigate server-side,
  never-fail -> needs_review, import depuis core.navigation (boot 5005 garanti)
- 131 tests verts (wiring boot, e2e handler, unit modules)

Chantier Qwen 01-02/07/2026, revue croisee Claude (plan deploy v2).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/unit/test_navigate_wiring.py

@@ -0,0 +1,62 @@
+"""Boot non-regression test for navigate wiring — catches import/regression bugs.
+
+This test would have caught the ImportError where _handle_navigate_action
+was incorrectly imported from replay_engine instead of core/navigation.
+"""
+
+import pytest
+
+
+class TestApiStreamImports:
+    """(1) api_stream must import without error."""
+
+    def test_import_api_stream(self):
+        from agent_v0.server_v1 import api_stream
+        assert api_stream is not None
+
+
+class TestAllowedActionTypes:
+    """(2) 'navigate' must be in both _ALLOWED and _SERVER_SIDE."""
+
+    def test_navigate_in_allowed(self):
+        from agent_v0.server_v1.replay_engine import _ALLOWED_ACTION_TYPES
+        assert "navigate" in _ALLOWED_ACTION_TYPES
+
+    def test_navigate_in_server_side(self):
+        from agent_v0.server_v1.replay_engine import _SERVER_SIDE_ACTION_TYPES
+        assert "navigate" in _SERVER_SIDE_ACTION_TYPES
+
+
+class TestNavigateHandlerCallable:
+    """(3) _handle_navigate_action must be callable with correct signature."""
+
+    def test_handler_imported_from_core_navigation(self):
+        from core.navigation import _handle_navigate_action
+        assert callable(_handle_navigate_action)
+
+    def test_handler_imported_in_api_stream(self):
+        from agent_v0.server_v1 import api_stream
+        handler = api_stream._handle_navigate_action
+        assert callable(handler)
+
+    def test_handler_signature(self):
+        """Signature: (action: dict, replay_state: dict, session_id: str) -> bool."""
+        from core.navigation import _handle_navigate_action
+        import inspect
+        sig = inspect.signature(_handle_navigate_action)
+        params = list(sig.parameters.keys())
+        assert params == ["action", "replay_state", "session_id"]
+        assert sig.return_annotation == bool
+
+
+class TestDispatchBlockExists:
+    """Verify the navigate dispatch block is wired in api_stream."""
+
+    def test_navigate_dispatch_reference(self):
+        """Source must contain the navigate dispatch elif block."""
+        import agent_v0.server_v1.api_stream as mod
+        source = inspect.getsource(mod)
+        assert "type_ == \"navigate\"" in source
+
+
+import inspect