uv-lfs: fix CI — add setup-uv action and ruff lint

- Add astral-sh/setup-uv@v5 before uv sync in all workflows
  (build release, prebuilt, model_review) so uv is available
- Fix ruff B904: use `raise ... from e` in protocol.py

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: adeebshihadeh

.github/workflows/model_review.yaml

@@ -24,6 +24,7 @@ jobs:
         with:
           ref: master
           path: base
+      - uses: astral-sh/setup-uv@v5
       - run: uv sync --frozen --all-extras && .venv/bin/uv-lfs install && .venv/bin/uv-lfs checkout
       - run: cd base && uv sync --frozen --all-extras && .venv/bin/uv-lfs install && .venv/bin/uv-lfs checkout
 

.github/workflows/prebuilt.yaml

@@ -32,6 +32,7 @@ jobs:
     - uses: actions/checkout@v6
       with:
         submodules: true
+    - uses: astral-sh/setup-uv@v5
     - run: uv sync --frozen --all-extras && .venv/bin/uv-lfs install && .venv/bin/uv-lfs checkout
     - name: Build and Push docker image
       run: |

.github/workflows/tests.yaml

@@ -38,6 +38,7 @@ jobs:
     - uses: actions/checkout@v6
       with:
         submodules: true
+    - uses: astral-sh/setup-uv@v5
     - name: Install uv-lfs
       run: uv sync --frozen --all-extras && .venv/bin/uv-lfs install
     - name: Getting LFS files

tools/uv_lfs/protocol.py

@@ -42,8 +42,8 @@ def read_pkt_line(stream) -> bytes | None:
     return None
   try:
     length = int(header, 16)
-  except ValueError:
-    raise EOFError(f"invalid pkt-line header: {header!r}")
+  except ValueError as e:
+    raise EOFError(f"invalid pkt-line header: {header!r}") from e
   if length <= 4:
     return b""
   return _read_exact(stream, length - 4)