chore(ci): isolate Windows snapshot workspaces

Author: fengmk2

.github/workflows/ci.yml

@@ -1102,6 +1102,17 @@ jobs:
         with:
           tool: cargo-nextest
 
+      # Keep fixtures outside runner.temp: setup-node writes an .npmrc there,
+      # which Yarn Classic discovers when walking parent directories.
+      - name: Create NTFS snapshot temp directory
+        id: snapshot-temp
+        shell: pwsh
+        run: |
+          $volume = [System.IO.Path]::GetPathRoot($env:RUNNER_TEMP)
+          $snapshotTemp = Join-Path $volume ('vp-snapshots-' + [guid]::NewGuid().ToString('N'))
+          New-Item -ItemType Directory -Path $snapshotTemp | Out-Null
+          "directory=$snapshotTemp" >> $env:GITHUB_OUTPUT
+
       # `cargo-nextest` is invoked directly so the job never depends on the
       # runner's Rust toolchain. --workspace-remap makes nextest rewrite
       # CARGO_MANIFEST_DIR and CARGO_BIN_EXE_vpt to this checkout, which is
@@ -1127,7 +1138,7 @@ jobs:
           # Rust's GetTempPath2 ignores TEMP/TMP under the SYSTEM account.
           # Use the runner's NTFS workspace volume: C:\Windows\SystemTemp
           # rejects the case-sensitive directory flag on these hosts.
-          SystemTemp: ${{ runner.temp }}
+          SystemTemp: ${{ steps.snapshot-temp.outputs.directory }}
           # Keep Windows env parity with the `test` recipe in justfile.
           __COMPAT_LAYER: RunAsInvoker
 

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/windows_case_sensitive_shims/later-shim.cjs

@@ -0,0 +1,4 @@
+const fs = require('node:fs');
+
+fs.mkdirSync('node_modules/.bin', { recursive: true });
+fs.writeFileSync('node_modules/.bin/astro.CMD', '@echo wrong workspace shim %*\r\n');

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/windows_case_sensitive_shims/snapshots.toml

@@ -7,7 +7,7 @@ steps = [
   { argv = ["node", "setup.cjs"], snapshot = false },
   { argv = ["vp", "run", "probe"], tty = false, comment = "Nested task planning resolves the lowercase shim with uppercase PATHEXT." },
   { argv = ["vp", "exec", "astro", "--version"], cwd = "packages/app", tty = false },
-  { argv = ["vpt", "write-file", "node_modules/.bin/astro.CMD", "@echo wrong workspace shim %*"], snapshot = false },
+  { argv = ["node", "later-shim.cjs"], snapshot = false },
   { argv = ["vp", "run", "probe"], tty = false, comment = "The earlier package-local lowercase shim wins over a later uppercase shim." },
   { argv = ["vp", "exec", "astro", "--version"], cwd = "packages/app", tty = false },
   { argv = ["vp", "run", "cached"], cwd = "packages/app", tty = false },

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/windows_case_sensitive_shims/snapshots/windows_case_sensitive_shims.global.md

@@ -18,7 +18,7 @@ local shim --version
 local shim --version
 ```
 
-## `vpt write-file node_modules/.bin/astro.CMD "@echo wrong workspace shim %*"`
+## `node later-shim.cjs`
 
 
 ## `vp run probe`

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/windows_case_sensitive_shims/snapshots/windows_case_sensitive_shims.local.md

@@ -18,7 +18,7 @@ local shim --version
 local shim --version
 ```
 
-## `vpt write-file node_modules/.bin/astro.CMD "@echo wrong workspace shim %*"`
+## `node later-shim.cjs`
 
 
 ## `vp run probe`