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>

agent_v0/server_v1/replay_engine.py

@@ -41,6 +41,7 @@ _ALLOWED_ACTION_TYPES = {
     "extract_text",      # OCR serveur sur dernier heartbeat → variable workflow
     "extract_table",     # OCR serveur + filtre regex → liste structurée (boucle)
     "extract_dossier",   # OCR grille structurée → dossier patient persisté (brique 3)
+    "navigate",          # Navigation visuelle → coords login/recherche (brique navigation)
     "extract_text_scroll", # Marker côté graphe — expansé en sous-actions par _edge_to_normalized_actions
     "_concat_text_vars",   # Action serveur interne (générée par expansion extract_text_scroll)
     "t2a_decision",      # Analyse LLM facturation T2A → variable workflow
@@ -55,6 +56,7 @@ _SERVER_SIDE_ACTION_TYPES = {
     "extract_text",
     "extract_table",
     "extract_dossier",
+    "navigate",
     "t2a_decision",
     "llm_generate",
     "_concat_text_vars",