ci(windows): swap install smoke for ls smoke — dist gap upstream

The "install hyperfine" smoke step on \`test-windows\` failed with
\`Error: CmdNotFound("hyperfine")\`. Investigation: hyperfine has no
Windows build in \`dist.pkgx.dev\`. Exhaustive probe of all 842 top-
level prefixes in the bucket found zero packages with a \`windows/\`
subdir — pkgx-on-Windows can pull \`pkgx.exe\` itself but no other
package. \`pkgm install\` on Windows is blocked on upstream shipping
Windows artifacts, independent of pkgm's port.

Drop the install step (it can't pass), keep the \`--version\` floor,
and add a \`pkgm ls\` smoke that exercises install_prefix() (now
%LOCALAPPDATA%\pkgm) and the new Windows candidate-paths branch in
ls() without depending on a real install.

Job no longer needs \`continue-on-error: true\` — both remaining
steps are deterministically achievable on Windows today.

Author: tannevaled

.github/workflows/ci.yml

@@ -109,13 +109,18 @@ jobs:
           ./pkgm.ts i spotify_player
           spotify_player --version
 
-  # Scaffolding-pass smoke test for the Windows port. Uses an explicit
+  # Scaffolding-pass smoke for the Windows port. Uses an explicit
   # `pkgx deno^2.1 run` invocation because the kernel doesn't interpret
   # `#!/usr/bin/env -S pkgx …` shebangs on Windows; a `pkgm.cmd` wrapper
   # that papers over this belongs in pkgxdev/setup's installer.ps1, not
-  # here. continue-on-error: true while the port is in progress.
+  # here.
+  #
+  # End-to-end install can't be exercised yet: a probe of all 842
+  # top-level prefixes in dist.pkgx.dev (the bucket pkgx pulls from)
+  # finds zero packages with a `windows/` subdir. pkgm install is
+  # blocked on upstream shipping Windows artifacts; we test what we
+  # can — that pkgm runs at all on Windows.
   test-windows:
-    continue-on-error: true
     runs-on: windows-latest
     defaults:
       run:
@@ -125,9 +130,9 @@ jobs:
       - uses: pkgxdev/setup@v4
 
       - name: smoke - pkgm --version
-        # Verifies the absolute floor: pkgx is on PATH, deno can run
-        # the script, libpkgx imports resolve on Windows, parseArgs +
-        # the `version` arm exit 0. No filesystem touching yet.
+        # Verifies the floor: pkgx.exe is on PATH, deno can run the
+        # script, libpkgx imports resolve on Windows, parseArgs + the
+        # version arm exit 0. No filesystem touching yet.
         run: |
           $denoArgs = @(
             'deno^2.1', 'run', '--ext=ts',
@@ -139,27 +144,22 @@ jobs:
           pkgx @denoArgs
           if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
 
-      - name: smoke - install hyperfine
-        # Exercises the install path end-to-end on Windows. Expected to
-        # fail at one of: pantry resolution (if no Windows build), the
-        # hardlink-fallback path in symlink_with_overwrite, or the .cmd
-        # emission step. Failure mode is the discovery signal for the
-        # next iteration.
+      - name: smoke - pkgm ls on a fresh runner
+        # Exercises install_prefix() (now %LOCALAPPDATA%\pkgm on
+        # Windows) and the ls() candidate-paths branch. Fresh runner
+        # → no installed pkgs → empty output, exit 0. Catches regressions
+        # in the path-resolution layer without depending on
+        # dist.pkgx.dev having Windows builds.
         run: |
           $denoArgs = @(
             'deno^2.1', 'run', '--ext=ts',
             '--allow-sys=uid', '--allow-run', '--allow-env',
             '--allow-read', '--allow-write', '--allow-ffi',
             '--allow-net=dist.pkgx.dev',
-            './pkgm.ts', 'i', 'hyperfine'
+            './pkgm.ts', 'ls'
           )
           pkgx @denoArgs
           if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
-          $expected = Join-Path $env:LOCALAPPDATA "pkgm\pkgs\crates.io\hyperfine"
-          if (!(Test-Path $expected)) {
-            Write-Error "expected hyperfine cache at $expected"
-            exit 1
-          }
 
   # Validates `sudo pkgm install` behaviour fixed in 2b33f20:
   #  - privilege drop so pkgx cache stays owned by $SUDO_USER, not root