Revert "CI: pin XDG_CACHE_HOME=/runner/root/.cache on self-hosted runners"

This reverts commit ab8907a.

Author: claude

.github/workflows/deploy-pages.yml

@@ -23,10 +23,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
 
-      - name: Pin XDG_CACHE_HOME for self-hosted
-        if: runner.environment == 'self-hosted'
-        run: echo "XDG_CACHE_HOME=/runner/root/.cache" >> "$GITHUB_ENV"
-
       - name: Install uv
         uses: astral-sh/setup-uv@v5
 

.github/workflows/release.yml

@@ -28,10 +28,6 @@ jobs:
           fetch-depth: 0
           ref: ${{ github.ref_name }}
 
-      - name: Pin XDG_CACHE_HOME for self-hosted
-        if: runner.environment == 'self-hosted'
-        run: echo "XDG_CACHE_HOME=/runner/root/.cache" >> "$GITHUB_ENV"
-
       - uses: actions/setup-python@v6
         with:
           python-version: "3.12"

.github/workflows/tests.yml

@@ -12,12 +12,6 @@ permissions:
 
 env:
   FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: 'true'
-  # On self-hosted runners, the runner work dir lives on /runner which
-  # is a separate filesystem from /root — keep uv's cache on the same
-  # fs as the work dir so hard-linking into venvs succeeds (uv falls
-  # back to copying across fs boundaries, which is much slower). The
-  # "if" guards below no-op this on GitHub-hosted runners where the
-  # path doesn't exist.
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
@@ -32,10 +26,6 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
-    - name: Pin XDG_CACHE_HOME for self-hosted
-      if: runner.environment == 'self-hosted'
-      run: echo "XDG_CACHE_HOME=/runner/root/.cache" >> "$GITHUB_ENV"
-
     - name: Setup Python
       uses: actions/setup-python@v6
       with:
@@ -74,10 +64,6 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
-    - name: Pin XDG_CACHE_HOME for self-hosted
-      if: runner.environment == 'self-hosted'
-      run: echo "XDG_CACHE_HOME=/runner/root/.cache" >> "$GITHUB_ENV"
-
     - name: Discover standard test files
       id: set-matrix
       run: |
@@ -125,15 +111,11 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
-    - name: Pin XDG_CACHE_HOME for self-hosted
-      if: runner.environment == 'self-hosted'
-      run: echo "XDG_CACHE_HOME=/runner/root/.cache" >> "$GITHUB_ENV"
-
     - name: Setup Python
       uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.target.python_version }}
-
+   
     - name: Install uv
       uses: astral-sh/setup-uv@v8.0.0
       with:
@@ -258,10 +240,6 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
-    - name: Pin XDG_CACHE_HOME for self-hosted
-      if: runner.environment == 'self-hosted'
-      run: echo "XDG_CACHE_HOME=/runner/root/.cache" >> "$GITHUB_ENV"
-
     - name: Discover live integration test files
       id: set-matrix
       run: |
@@ -312,10 +290,6 @@ jobs:
     steps:
     - uses: actions/checkout@v6
 
-    - name: Pin XDG_CACHE_HOME for self-hosted
-      if: runner.environment == 'self-hosted'
-      run: echo "XDG_CACHE_HOME=/runner/root/.cache" >> "$GITHUB_ENV"
-
     - name: Setup Python
       uses: actions/setup-python@v6
       with: