diff --git a/app/git_sync.py b/app/git_sync.py
new file mode 100644
index 0000000..dcb9bc5
--- /dev/null
+++ b/app/git_sync.py
@@ -0,0 +1,115 @@
+"""
+Projection Markdown durable des memory_entries + commit Git automatique.
+SQLite (models.py) reste la source servie en instantane par l'API/MCP ;
+ce module ne fait que projeter et versionner, jamais l'inverse (on ne relit
+jamais le .md pour repondre a une requete).
+"""
+import os
+import logging
+from datetime import datetime, timezone
+from typing import Dict, Any, List
+
+import httpx
+
+from app.models import list_memory_entries
+
+logger = logging.getLogger(__name__)
+
+GITEA_INTERNAL_URL = "http://172.17.0.1:3232"  # jamais l'IP LAN depuis un container
+GITEA_REPO = "bolbol/context-hub"
+GITEA_TOKEN_ENV = "GITEA_TOKEN"
+
+TYPE_ORDER = ["decision", "constraint", "best-practice", "common-error", "do-not-use"]
+TYPE_LABELS = {
+    "decision": "Decisions",
+    "constraint": "Contraintes",
+    "best-practice": "Bonnes pratiques",
+    "common-error": "Erreurs communes",
+    "do-not-use": "A ne pas reessayer",
+}
+
+
+def _render_entry(e: Dict[str, Any]) -> str:
+    tags = ", ".join(e.get("tags") or [])
+    tags_line = f" — tags: {tags}" if tags else ""
+    return (
+        f"- **[{e['id']}]** {e['title']}\n"
+        f"  {e['body']}\n"
+        f"  _cree par {e['created_by']} le {e['created_at']}{tags_line}_\n"
+    )
+
+
+def render_scope_markdown(scope: str, entries: List[Dict[str, Any]]) -> str:
+    generated_at = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
+    lines = [
+        f"# Memoire {scope} — genere automatiquement, ne pas editer a la main",
+        "",
+        "> Source de verite operationnelle : table `memory_entries` dans context-hub (SQLite + API/MCP).",
+        "> Ce fichier est une projection durable et versionnee, regeneree a chaque `record_lesson`.",
+        f"> Derniere generation : {generated_at}",
+        "",
+    ]
+
+    by_project: Dict[Any, List[Dict[str, Any]]] = {}
+    for e in entries:
+        by_project.setdefault(e.get("project"), []).append(e)
+
+    projects = sorted(by_project.keys(), key=lambda p: (p is not None, p or ""))
+
+    if not entries:
+        lines.append("_Aucune entree active pour ce scope._")
+
+    for project in projects:
+        heading = "## Transverse" if project is None else f"## Projet: {project}"
+        lines.append(heading)
+        lines.append("")
+        by_type: Dict[str, List[Dict[str, Any]]] = {}
+        for e in by_project[project]:
+            by_type.setdefault(e["type"], []).append(e)
+        for type_ in TYPE_ORDER:
+            if type_ not in by_type:
+                continue
+            lines.append(f"### {TYPE_LABELS[type_]}")
+            lines.append("")
+            for e in sorted(by_type[type_], key=lambda x: x["created_at"], reverse=True):
+                lines.append(_render_entry(e))
+        lines.append("")
+
+    return "\n".join(lines)
+
+
+async def push_scope_markdown(scope: str) -> Dict[str, Any]:
+    token = os.environ.get(GITEA_TOKEN_ENV)
+    if not token:
+        logger.warning("GITEA_TOKEN absent, projection %s.md non poussee", scope)
+        return {"pushed": False, "reason": "GITEA_TOKEN absent"}
+
+    entries = await list_memory_entries(scope, status="active")
+    content = render_scope_markdown(scope, entries)
+    path = f"docs/context-memory/{scope}.md"
+    url = f"{GITEA_INTERNAL_URL}/api/v1/repos/{GITEA_REPO}/contents/{path}"
+    headers = {"Authorization": f"token {token}"}
+
+    async with httpx.AsyncClient(timeout=10) as client:
+        get_resp = await client.get(url, headers=headers)
+        sha = get_resp.json().get("sha") if get_resp.status_code == 200 else None
+
+        import base64
+        payload = {
+            "message": f"memory: regeneration {scope}.md ({len(entries)} entrees actives)",
+            "content": base64.b64encode(content.encode()).decode(),
+            "branch": "main",
+        }
+        if sha:
+            payload["sha"] = sha
+            put_resp = await client.put(url, headers=headers, json=payload)
+        else:
+            put_resp = await client.post(url, headers=headers, json=payload)
+
+        if put_resp.status_code not in (200, 201):
+            logger.error("Push Gitea echoue pour %s: %s %s", path, put_resp.status_code, put_resp.text[:300])
+            return {"pushed": False, "reason": f"HTTP {put_resp.status_code}"}
+
+        commit_sha = put_resp.json().get("commit", {}).get("sha", "")[:8]
+        logger.info("Projection %s poussee, commit %s", path, commit_sha)
+        return {"pushed": True, "commit": commit_sha, "path": path}