Reduce supported platform matrix

internal/artifacts/extraction_catalog_test.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"os"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -117,9 +116,6 @@ func TestInspectExtractionEvidenceClassifiesBundleStates(t *testing.T) {
 			paths.Root = t.TempDir()
 		}},
 		{name: "unsafe symlink", state: ExtractionEvidenceUnsafe, mutate: func(t *testing.T, _ *SessionPaths, m *manifest.Manifest) {
-			if runtime.GOOS == "windows" {
-				t.Skip("symlink creation requires privileges on Windows")
-			}
 			path := m.Stages["extract"].Outputs[0].LocalPath
 			outside := filepath.Join(t.TempDir(), "outside.json")
 			writeExtractionFixtureFile(t, outside, `{"outside":true}`)

internal/artifacts/lock_unsupported.go

@@ -1,11 +1,10 @@
-//go:build !linux && !darwin && !windows
+//go:build !linux && !darwin
 
 package artifacts
 
 import (
 	"fmt"
 	"os"
-	"runtime"
 )
 
 func acquireHeldFileLock(_ *os.File) error {

internal/artifacts/lock_windows.go

@@ -1,29 +0,0 @@
-//go:build windows
-
-package artifacts
-
-import (
-	"errors"
-	"os"
-
-	"golang.org/x/sys/windows"
-)
-
-func acquireHeldFileLock(file *os.File) error {
-	err := windows.LockFileEx(
-		windows.Handle(file.Fd()),
-		windows.LOCKFILE_EXCLUSIVE_LOCK|windows.LOCKFILE_FAIL_IMMEDIATELY,
-		0,
-		1,
-		0,
-		&windows.Overlapped{},
-	)
-	if errors.Is(err, windows.ERROR_LOCK_VIOLATION) {
-		return errHeldLockConflict
-	}
-	return err
-}
-
-func releaseHeldFileLock(file *os.File) error {
-	return windows.UnlockFileEx(windows.Handle(file.Fd()), 0, 1, 0, &windows.Overlapped{})
-}