diff --git a/core/knowledge/__init__.py b/core/knowledge/__init__.py
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index 000000000..e69de29bb
diff --git a/core/knowledge/ui_patterns.py b/core/knowledge/ui_patterns.py
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+++ b/core/knowledge/ui_patterns.py
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+"""
+Base de connaissances des patterns d'interface utilisateur.
+
+Donne à Léa des "réflexes natifs" : quand elle reconnaît un pattern UI
+connu (dialogue OK/Annuler, menu, barre d'outils), elle sait immédiatement
+quoi faire sans avoir besoin de l'apprendre par observation.
+
+Sources :
+- GUI-R1 dataset (3K exemples annotés, ritzzai/GUI-R1)
+- Patterns Windows/Linux courants
+- Conventions UI universelles
+
+Utilisation :
+    from core.knowledge.ui_patterns import UIPatternLibrary
+    lib = UIPatternLibrary()
+    match = lib.find_pattern("Voulez-vous enregistrer ?")
+    # → {'action': 'click', 'target': 'Enregistrer', 'zone': 'dialog_center', ...}
+"""
+
+import json
+import logging
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any, Dict, List, Optional, Tuple
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class UIPattern:
+    """Un pattern d'interface connu."""
+    name: str
+    category: str
+    triggers: List[str]
+    action: str
+    target: str
+    typical_zone: str
+    typical_bbox: Optional[List[float]] = None
+    os: str = "any"
+    confidence: float = 0.9
+    metadata: Dict[str, Any] = field(default_factory=dict)
+
+
+# Patterns Windows natifs — réflexes de base
+BUILTIN_PATTERNS: List[Dict[str, Any]] = [
+    # === DIALOGUES DE CONFIRMATION ===
+    {
+        "name": "dialog_save",
+        "category": "dialog",
+        "triggers": [
+            "voulez-vous enregistrer", "do you want to save",
+            "save changes", "enregistrer les modifications",
+            "sauvegarder", "unsaved changes",
+        ],
+        "action": "click",
+        "target": "Enregistrer",
+        "alternatives": ["Save", "Oui", "Yes"],
+        "typical_zone": "dialog_center",
+        "typical_bbox": [0.35, 0.55, 0.50, 0.65],
+        "os": "any",
+    },
+    {
+        "name": "dialog_cancel",
+        "category": "dialog",
+        "triggers": [
+            "annuler", "cancel", "abandonner", "discard",
+        ],
+        "action": "click",
+        "target": "Annuler",
+        "alternatives": ["Cancel", "Non", "No"],
+        "typical_zone": "dialog_center",
+        "typical_bbox": [0.50, 0.55, 0.65, 0.65],
+        "os": "any",
+    },
+    {
+        "name": "dialog_ok",
+        "category": "dialog",
+        "triggers": [
+            "ok", "d'accord", "compris", "information",
+            "erreur", "error", "warning", "avertissement",
+        ],
+        "action": "click",
+        "target": "OK",
+        "alternatives": ["Fermer", "Close", "Compris"],
+        "typical_zone": "dialog_center",
+        "typical_bbox": [0.45, 0.60, 0.55, 0.70],
+        "os": "any",
+    },
+    {
+        "name": "dialog_yes_no",
+        "category": "dialog",
+        "triggers": [
+            "êtes-vous sûr", "are you sure", "confirmer",
+            "confirm", "supprimer", "delete",
+        ],
+        "action": "click",
+        "target": "Oui",
+        "alternatives": ["Yes", "Confirmer", "Confirm"],
+        "typical_zone": "dialog_center",
+        "typical_bbox": [0.35, 0.60, 0.45, 0.68],
+        "os": "any",
+    },
+
+    # === NAVIGATION FENÊTRE ===
+    {
+        "name": "window_close",
+        "category": "window",
+        "triggers": ["fermer la fenêtre", "close window"],
+        "action": "click",
+        "target": "X",
+        "typical_zone": "titlebar",
+        "typical_bbox": [0.96, 0.0, 1.0, 0.04],
+        "os": "windows",
+    },
+    {
+        "name": "window_minimize",
+        "category": "window",
+        "triggers": ["minimiser", "minimize"],
+        "action": "click",
+        "target": "_",
+        "typical_zone": "titlebar",
+        "typical_bbox": [0.90, 0.0, 0.94, 0.04],
+        "os": "windows",
+    },
+    {
+        "name": "window_maximize",
+        "category": "window",
+        "triggers": ["maximiser", "maximize", "agrandir"],
+        "action": "click",
+        "target": "□",
+        "typical_zone": "titlebar",
+        "typical_bbox": [0.94, 0.0, 0.96, 0.04],
+        "os": "windows",
+    },
+
+    # === MENUS ===
+    {
+        "name": "menu_file",
+        "category": "menu",
+        "triggers": ["menu fichier", "menu file", "ouvrir fichier", "open file"],
+        "action": "click",
+        "target": "Fichier",
+        "alternatives": ["File"],
+        "typical_zone": "menu_toolbar",
+        "typical_bbox": [0.0, 0.03, 0.06, 0.06],
+        "os": "any",
+    },
+    {
+        "name": "menu_edit",
+        "category": "menu",
+        "triggers": ["édition", "edit", "modifier"],
+        "action": "click",
+        "target": "Édition",
+        "alternatives": ["Edit"],
+        "typical_zone": "menu_toolbar",
+        "typical_bbox": [0.06, 0.03, 0.12, 0.06],
+        "os": "any",
+    },
+
+    # === FORMULAIRES ===
+    {
+        "name": "form_submit",
+        "category": "form",
+        "triggers": [
+            "valider", "submit", "envoyer", "send",
+            "connexion", "login", "se connecter", "sign in",
+        ],
+        "action": "click",
+        "target": "Valider",
+        "alternatives": ["Submit", "Envoyer", "Connexion", "Login", "OK"],
+        "typical_zone": "content",
+        "typical_bbox": [0.35, 0.70, 0.65, 0.80],
+        "os": "any",
+    },
+    {
+        "name": "form_search",
+        "category": "form",
+        "triggers": ["rechercher", "search", "chercher", "find"],
+        "action": "click",
+        "target": "Rechercher",
+        "alternatives": ["Search", "🔍", "Go"],
+        "typical_zone": "menu_toolbar",
+        "typical_bbox": [0.30, 0.03, 0.70, 0.06],
+        "os": "any",
+    },
+
+    # === NAVIGATION WEB ===
+    {
+        "name": "cookie_accept",
+        "category": "popup",
+        "triggers": [
+            "accepter les cookies", "accept cookies",
+            "j'accepte", "accept all", "tout accepter",
+            "consent", "consentement",
+        ],
+        "action": "click",
+        "target": "Accepter",
+        "alternatives": ["Accept", "Accept All", "Tout accepter", "J'accepte"],
+        "typical_zone": "content",
+        "typical_bbox": [0.30, 0.80, 0.70, 0.90],
+        "os": "any",
+    },
+
+    # === RACCOURCIS UNIVERSELS ===
+    {
+        "name": "shortcut_save",
+        "category": "shortcut",
+        "triggers": ["sauvegarder", "enregistrer", "save"],
+        "action": "hotkey",
+        "target": "ctrl+s",
+        "typical_zone": "keyboard",
+        "os": "any",
+    },
+    {
+        "name": "shortcut_undo",
+        "category": "shortcut",
+        "triggers": ["annuler action", "undo", "défaire"],
+        "action": "hotkey",
+        "target": "ctrl+z",
+        "typical_zone": "keyboard",
+        "os": "any",
+    },
+    {
+        "name": "shortcut_copy",
+        "category": "shortcut",
+        "triggers": ["copier", "copy"],
+        "action": "hotkey",
+        "target": "ctrl+c",
+        "typical_zone": "keyboard",
+        "os": "any",
+    },
+    {
+        "name": "shortcut_paste",
+        "category": "shortcut",
+        "triggers": ["coller", "paste"],
+        "action": "hotkey",
+        "target": "ctrl+v",
+        "typical_zone": "keyboard",
+        "os": "any",
+    },
+]
+
+
+class UIPatternLibrary:
+    """Bibliothèque de patterns UI connus.
+
+    Fournit des "réflexes natifs" à Léa : quand un pattern
+    est reconnu dans le texte OCR ou le contexte visuel,
+    elle sait immédiatement quoi faire.
+    """
+
+    def __init__(self, extra_patterns_path: Optional[str] = None):
+        self._patterns: List[UIPattern] = []
+        self._load_builtin()
+        if extra_patterns_path:
+            self._load_from_file(extra_patterns_path)
+        logger.info(f"UIPatternLibrary: {len(self._patterns)} patterns chargés")
+
+    def _load_builtin(self):
+        for p in BUILTIN_PATTERNS:
+            self._patterns.append(UIPattern(
+                name=p["name"],
+                category=p["category"],
+                triggers=p["triggers"],
+                action=p["action"],
+                target=p["target"],
+                typical_zone=p.get("typical_zone", "content"),
+                typical_bbox=p.get("typical_bbox"),
+                os=p.get("os", "any"),
+                metadata={
+                    "alternatives": p.get("alternatives", []),
+                    "source": "builtin",
+                },
+            ))
+
+    def _load_from_file(self, path: str):
+        filepath = Path(path)
+        if not filepath.exists():
+            logger.warning(f"Fichier patterns non trouvé: {path}")
+            return
+        try:
+            with open(filepath) as f:
+                data = json.load(f)
+            for p in data.get("patterns", []):
+                self._patterns.append(UIPattern(
+                    name=p["name"],
+                    category=p.get("category", "custom"),
+                    triggers=p.get("triggers", []),
+                    action=p.get("action", "click"),
+                    target=p.get("target", ""),
+                    typical_zone=p.get("typical_zone", "content"),
+                    typical_bbox=p.get("typical_bbox"),
+                    os=p.get("os", "any"),
+                    metadata=p.get("metadata", {}),
+                ))
+            logger.info(f"Chargé {len(data.get('patterns', []))} patterns depuis {path}")
+        except Exception as e:
+            logger.error(f"Erreur chargement patterns: {e}")
+
+    def find_pattern(
+        self,
+        text: str,
+        os_filter: Optional[str] = None,
+    ) -> Optional[Dict[str, Any]]:
+        """Cherche un pattern UI dans du texte (OCR, titre fenêtre, etc.).
+
+        Args:
+            text: Texte à analyser (peut contenir du bruit OCR)
+            os_filter: Filtrer par OS ("windows", "linux", None=tous)
+
+        Returns:
+            Dict avec action, target, confidence, etc. ou None
+        """
+        text_lower = text.lower()
+        best_match = None
+        best_score = 0
+
+        for pattern in self._patterns:
+            if os_filter and pattern.os not in ("any", os_filter):
+                continue
+
+            score = 0
+            matched_trigger = None
+            for trigger in pattern.triggers:
+                if trigger in text_lower:
+                    trigger_score = len(trigger) / max(len(text_lower), 1)
+                    if trigger_score > score:
+                        score = trigger_score
+                        matched_trigger = trigger
+
+            if score > best_score and score > 0.05:
+                best_score = score
+                best_match = {
+                    "pattern": pattern.name,
+                    "category": pattern.category,
+                    "action": pattern.action,
+                    "target": pattern.target,
+                    "alternatives": pattern.metadata.get("alternatives", []),
+                    "typical_zone": pattern.typical_zone,
+                    "typical_bbox": pattern.typical_bbox,
+                    "confidence": min(pattern.confidence * (1 + score), 1.0),
+                    "matched_trigger": matched_trigger,
+                    "os": pattern.os,
+                }
+
+        return best_match
+
+    def find_by_category(self, category: str) -> List[Dict[str, Any]]:
+        """Retourne tous les patterns d'une catégorie."""
+        return [
+            {
+                "name": p.name,
+                "action": p.action,
+                "target": p.target,
+                "triggers": p.triggers,
+                "typical_zone": p.typical_zone,
+            }
+            for p in self._patterns
+            if p.category == category
+        ]
+
+    def get_dialog_handler(self, dialog_text: str) -> Optional[Dict[str, Any]]:
+        """Raccourci : cherche un pattern de dialogue."""
+        match = self.find_pattern(dialog_text)
+        if match and match["category"] == "dialog":
+            return match
+        return self.find_pattern(dialog_text)
+
+    def add_pattern(self, pattern_dict: Dict[str, Any]):
+        """Ajoute un pattern dynamiquement (ex: appris par observation)."""
+        self._patterns.append(UIPattern(
+            name=pattern_dict["name"],
+            category=pattern_dict.get("category", "learned"),
+            triggers=pattern_dict.get("triggers", []),
+            action=pattern_dict.get("action", "click"),
+            target=pattern_dict.get("target", ""),
+            typical_zone=pattern_dict.get("typical_zone", "content"),
+            typical_bbox=pattern_dict.get("typical_bbox"),
+            os=pattern_dict.get("os", "any"),
+            confidence=pattern_dict.get("confidence", 0.7),
+            metadata={"source": "learned"},
+        ))
+
+    def save_to_file(self, path: str):
+        """Sauvegarde tous les patterns (builtin + appris) dans un fichier."""
+        data = {
+            "patterns": [
+                {
+                    "name": p.name,
+                    "category": p.category,
+                    "triggers": p.triggers,
+                    "action": p.action,
+                    "target": p.target,
+                    "typical_zone": p.typical_zone,
+                    "typical_bbox": p.typical_bbox,
+                    "os": p.os,
+                    "confidence": p.confidence,
+                    "metadata": p.metadata,
+                }
+                for p in self._patterns
+            ]
+        }
+        with open(path, "w", encoding="utf-8") as f:
+            json.dump(data, f, indent=2, ensure_ascii=False)
+        logger.info(f"Sauvegardé {len(self._patterns)} patterns dans {path}")
+
+    @property
+    def stats(self) -> Dict[str, int]:
+        from collections import Counter
+        cats = Counter(p.category for p in self._patterns)
+        return {"total": len(self._patterns), "by_category": dict(cats)}