wedge(T034): snapshot commits to registry audit/ via Forgejo contents API

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

ledger/src/m2_ledger/api.py

@@ -143,6 +143,11 @@ def snapshot(conn=Depends(get_conn), _key: str = Depends(require_admin)):
     date = datetime.now(timezone.utc).strftime("%Y-%m-%d")
     path = f"audit/{date}.json"
     content = json.dumps(balances, sort_keys=True, indent=2)
-    # TODO(T034): commit `content` to `path` in m2/market-registry via Forgejo API
-    # (REGISTRY_REPO_URL + FORGEJO_TOKEN); this endpoint only produces the JSON.
-    return {"path": path, "content": content}
+    from m2_ledger.snapshot import SnapshotError, commit_snapshot
+
+    try:
+        result = commit_snapshot(path, content)
+    except SnapshotError as exc:
+        # Snapshot content is still returned so an operator can commit by hand.
+        return {"path": path, "content": content, "committed": False, "error": str(exc)}
+    return {"path": path, "content": content, "committed": True, "commit": result["commit"]}

ledger/src/m2_ledger/snapshot.py

@@ -0,0 +1,42 @@
+"""Daily balance snapshot → committed to the registry's audit/ (constitution V, T034).
+
+The commit uses the Forgejo contents API: create the file, or update it (same-day
+re-runs) with the current blob sha. Config via env: FORGEJO_URL, FORGEJO_TOKEN,
+REGISTRY_REPO (default m2/market-registry), FORGEJO_USER (default m2).
+"""
+
+from __future__ import annotations
+
+import base64
+import os
+
+import httpx
+
+
+class SnapshotError(RuntimeError):
+    pass
+
+
+def commit_snapshot(path: str, content: str) -> dict:
+    forgejo_url = os.environ.get("FORGEJO_URL", "https://git.machinemachine.ai").rstrip("/")
+    token = os.environ.get("FORGEJO_TOKEN", "")
+    repo = os.environ.get("REGISTRY_REPO", "m2/market-registry")
+    user = os.environ.get("FORGEJO_USER", "m2")
+    if not token:
+        raise SnapshotError("FORGEJO_TOKEN not set — snapshot produced but not committed")
+
+    api = f"{forgejo_url}/api/v1/repos/{repo}/contents/{path}"
+    b64 = base64.b64encode(content.encode()).decode()
+    message = f"audit: ledger balance snapshot {path.rsplit('/', 1)[-1]}"
+
+    with httpx.Client(auth=(user, token), timeout=15.0) as client:
+        existing = client.get(api)
+        if existing.status_code == 200:
+            sha = existing.json().get("sha")
+            resp = client.put(api, json={"content": b64, "message": message, "sha": sha})
+        else:
+            resp = client.post(api, json={"content": b64, "message": message})
+        if resp.status_code not in (200, 201):
+            raise SnapshotError(f"registry commit failed: {resp.status_code} {resp.text[:200]}")
+        data = resp.json()
+    return {"path": path, "commit": (data.get("commit") or {}).get("sha")}