Switch LFS backend from GitHub LFS to lfs.dimensionalos.com

.lfsconfig

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+[lfs]
+	url = https://lfs.dimensionalos.com/dimensionalOS/dimos

dimos/utils/test_lfs.py

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+# Copyright 2025-2026 Dimensional Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Smoke tests for the dimos Git LFS server (lfs.dimensionalos.com).
+
+These talk to the LFS batch API directly (no `git lfs` toolchain), so when CI
+fails the diagnostic is "the LFS server returned X" rather than the looser
+"git lfs pull failed". The end-to-end smudge test lives in test_data.py.
+"""
+
+import hashlib
+import urllib.request
+
+import pytest
+import requests
+
+LFS_URL = "https://lfs.dimensionalos.com/dimensionalOS/dimos"
+
+# Known fixture: cafe.jpg.tar.gz pointer in dev. SHA + size match the LFS
+# pointer file at data/.lfs/cafe.jpg.tar.gz.
+KNOWN_OID = "b8cf30439b41033ccb04b09b9fc8388d18fb544d55b85c155dbf85700b9e7603"
+KNOWN_SIZE = 136165
+
+
+def _batch(operation: str, oid: str, size: int, *, auth=None):
+    return requests.post(
+        f"{LFS_URL}/objects/batch",
+        json={
+            "operation": operation,
+            "transfers": ["basic"],
+            "objects": [{"oid": oid, "size": size}],
+        },
+        headers={
+            "Accept": "application/vnd.git-lfs+json",
+            "Content-Type": "application/vnd.git-lfs+json",
+        },
+        auth=auth,
+        timeout=15,
+    )
+
+
+@pytest.mark.slow
+def test_anonymous_download_returns_presigned_url():
+    """An unauthenticated batch download request returns a presigned S3 URL."""
+    response = _batch("download", KNOWN_OID, KNOWN_SIZE)
+    response.raise_for_status()
+
+    obj = response.json()["objects"][0]
+    assert obj["oid"] == KNOWN_OID
+    assert "actions" in obj, f"no download action — server response: {obj}"
+
+    href = obj["actions"]["download"]["href"]
+    assert href.startswith("https://dimos-github-lfs.s3"), href
+
+
+@pytest.mark.slow
+def test_anonymous_upload_is_forbidden():
+    """An unauthenticated upload returns 403 — only repo collaborators can push."""
+    response = _batch("upload", "0" * 64, 1)
+    assert response.status_code == 403, response.text
+
+
+@pytest.mark.slow
+def test_known_object_roundtrip():
+    """Fetching the known fixture via giftless yields bytes whose SHA matches the pointer."""
+    response = _batch("download", KNOWN_OID, KNOWN_SIZE)
+    response.raise_for_status()
+    href = response.json()["objects"][0]["actions"]["download"]["href"]
+
+    with urllib.request.urlopen(href, timeout=30) as r:
+        body = r.read()
+
+    assert hashlib.sha256(body).hexdigest() == KNOWN_OID
+    assert len(body) == KNOWN_SIZE