dep(candle): Downgrade Candle to 0.9.2 for workspace; upgrade only in CUDA13 CI

- pin candle-core/candle-nn to the crates.io 0.9.x release so the macOS Metal backend runs on the stable, thread-tolerant implementation (0.9.2-alpha.1 breaks when the model is invoked off the creating thread, which hits our server).
- keep the Windows CUDA 13 build on the git tip temporarily by updating those crates during that GH Actions job only, then reverting the lockfile so the repo stays on 0.9.1 locally.
- mark cuda13 artifacts as “preview” to reflect the alpha Candle requirement.

Author: TimmyOVO

.github/workflows/build-extended-artifacts.yml

@@ -106,7 +106,7 @@ jobs:
           - cuda: '12.4.1'
             artifact_suffix: cuda12-4-1
           - cuda: '13.0.2'
-            artifact_suffix: cuda13-0-2
+            artifact_suffix: cuda13-0-2-preview
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -131,6 +131,33 @@ jobs:
           method: local
           log-file-suffix: windows-cuda.txt
 
+      - name: Switch Candle manifest to git tip
+        if: matrix.cuda == '13.0.2'
+        shell: pwsh
+        run: |
+          python - <<'PY'
+          from pathlib import Path
+
+          path = Path('Cargo.toml')
+          text = path.read_text()
+          stable_core = 'candle-core = { version = "0.9", default-features = false }'
+          stable_nn = 'candle-nn = { version = "0.9", default-features = false }'
+          git_core = 'candle-core = { git = "https://github.com/huggingface/candle", rev = "d4545ebbbfb37d3cf0e228642ffaaa75b5d6bce9", default-features = false }'
+          git_nn = 'candle-nn = { git = "https://github.com/huggingface/candle", rev = "d4545ebbbfb37d3cf0e228642ffaaa75b5d6bce9", default-features = false }'
+          if stable_core not in text or stable_nn not in text:
+              raise SystemExit('Expected stable candle deps not found in Cargo.toml')
+          text = text.replace(stable_core, git_core, 1)
+          text = text.replace(stable_nn, git_nn, 1)
+          path.write_text(text)
+          PY
+
+      - name: Upgrade Candle to git tip for CUDA 13
+        if: matrix.cuda == '13.0.2'
+        shell: pwsh
+        run: |
+          cargo update -p candle-core --git https://github.com/huggingface/candle --rev d4545ebbbfb37d3cf0e228642ffaaa75b5d6bce9
+          cargo update -p candle-nn   --git https://github.com/huggingface/candle --rev d4545ebbbfb37d3cf0e228642ffaaa75b5d6bce9
+
       - name: Locate MSVC toolchain
         shell: pwsh
         run: |
@@ -183,3 +210,8 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           files: deepseek-ocr-windows-${{ matrix.artifact_suffix }}.zip
+
+      - name: Restore manifest and lockfile
+        if: matrix.cuda == '13.0.2'
+        shell: pwsh
+        run: git checkout -- Cargo.toml Cargo.lock