fix(skills): remove ineffective app detection gate

internal/app/skill_setup.go

@@ -127,7 +127,6 @@ var (
 	skillSetupExecutable      = os.Executable
 	skillSetupGetwd           = os.Getwd
 	skillSetupUserHomeDir     = os.UserHomeDir
-	skillSetupSystemHomeDir   = os.UserHomeDir
 	skillSetupRemoveAll       = os.RemoveAll
 	skillSetupBackupAndRemove = upgrade.BackupAndRemoveSkillDir
 	skillSetupRestoreBackup   = upgrade.RestoreSkillPath
@@ -1097,24 +1096,20 @@ func detectExistingAgentHomes(home, mode string) []string {
 	dests := []string{canonical}
 	canonicalKey := skillSetupPathKey(canonical)
 	seen := map[string]bool{canonicalKey: true}
-	systemHome, _ := skillSetupSystemHomeDir()
-	allowSystemApps := sameSkillSetupPath(home, systemHome)
 	addDetected := func(rel, base string) {
 		detectedDir := filepath.Dir(base)
 		switch filepath.ToSlash(filepath.Clean(rel)) {
 		case ".config/kimchi/harness/skills", ".tabnine/agent/skills":
 			detectedDir = filepath.Dir(filepath.Dir(base))
 		case ".zcode/skills":
-			if allowSystemApps {
+			// Application bundles are machine-scoped detection signals. Keep this
-				if info, err := skillSetupStat(filepath.Join(string(filepath.Separator), "Applications", "ZCode.app")); err == nil && info.IsDir() {
+			// independent of HOME so setup matches npm, Shell, and PowerShell.
-					detectedDir = ""
+			if info, err := skillSetupStat(filepath.Join(string(filepath.Separator), "Applications", "ZCode.app")); err == nil && info.IsDir() {
-				}
+				detectedDir = ""
 			}
 		case ".minimax/skills":
-			if allowSystemApps {
+			if info, err := skillSetupStat(filepath.Join(string(filepath.Separator), "Applications", "MiniMax Code.app")); err == nil && info.IsDir() {
-				if info, err := skillSetupStat(filepath.Join(string(filepath.Separator), "Applications", "MiniMax Code.app")); err == nil && info.IsDir() {
+				detectedDir = ""
-					detectedDir = ""
-				}
 			}
 		}
 		if detectedDir != "" {

internal/app/skill_setup_canonical_test.go

@@ -101,8 +101,9 @@ func TestCrossPlatformCoverageSkillSetupCanonicalTargetsAndAgentCapabilities(t *
 }
 
 func TestCrossPlatformCoverageSkillSetupDetectsShallowAndApplicationAgents(t *testing.T) {
+	// Keep the destination HOME synthetic: app-bundle detection is deliberately
+	// machine-scoped and must not depend on the selected installation HOME.
 	home := t.TempDir()
-	testseam.Swap(t, &skillSetupSystemHomeDir, func() (string, error) { return home, nil })
 	testseam.Swap(t, &skillSetupGetenv, func(string) string { return "" })
 	for _, dir := range []string{filepath.Join(home, ".config", "kimchi"), filepath.Join(home, ".tabnine")} {
 		if err := os.MkdirAll(dir, 0o755); err != nil {

internal/upgrade/canonical_skills_test.go

@@ -162,8 +162,9 @@ func TestCrossPlatformCoverageCanonicalSkillLinksFallBackToCopies(t *testing.T)
 }
 
 func TestCrossPlatformCoverageConfiguredRootsDetectShallowAndApplicationAgents(t *testing.T) {
+	// Keep the destination HOME synthetic: app-bundle detection is deliberately
+	// machine-scoped and must not depend on the selected installation HOME.
 	home := t.TempDir()
-	testseam.Swap(t, &upgradeSystemHomeDir, func() (string, error) { return home, nil })
 	testseam.Swap(t, &upgradeGetenv, func(string) string { return "" })
 	for _, dir := range []string{filepath.Join(home, ".config", "kimchi"), filepath.Join(home, ".tabnine")} {
 		if err := os.MkdirAll(dir, 0o755); err != nil {
@@ -196,7 +197,7 @@ func TestCrossPlatformCoverageConfiguredRootsDetectShallowAndApplicationAgents(t
 	for _, root := range configuredSkillRoots(home) {
 		label := filepath.ToSlash(root.label)
 		if _, ok := want[label]; ok {
-			want[label] = skillRootDetectedBase(home, root)
+			want[label] = skillRootDetectedBase(root)
 		}
 	}
 	for label, detected := range want {

internal/upgrade/paths.go

@@ -141,7 +141,6 @@ var universalSkillDirs = map[string]bool{
 
 var (
 	upgradeUserHomeDir     = os.UserHomeDir
-	upgradeSystemHomeDir   = os.UserHomeDir
 	upgradeExecutable      = os.Executable
 	upgradeEvalSymlinks    = filepath.EvalSymlinks
 	upgradeCopyDir         = copyDir
@@ -693,26 +692,22 @@ func configuredSkillRoots(homeDir string) []resolvedSkillRoot {
 	return roots
 }
 
-func skillRootDetectedBase(homeDir string, root resolvedSkillRoot) bool {
+func skillRootDetectedBase(root resolvedSkillRoot) bool {
 	detectedDir := filepath.Dir(root.base)
-	systemHome, _ := upgradeSystemHomeDir()
-	allowSystemApps := skillRootPathKey(homeDir) == skillRootPathKey(systemHome)
 	switch filepath.ToSlash(filepath.Clean(root.label)) {
 	case ".config/kimchi/harness/skills":
 		detectedDir = filepath.Dir(filepath.Dir(root.base))
 	case ".tabnine/agent/skills":
 		detectedDir = filepath.Dir(filepath.Dir(root.base))
 	case ".zcode/skills":
-		if allowSystemApps {
+		// Application bundles are machine-scoped detection signals. Keep this
-			if info, err := upgradeStat(filepath.Join(string(filepath.Separator), "Applications", "ZCode.app")); err == nil && info.IsDir() {
+		// independent of HOME so upgrade matches npm, Shell, and PowerShell.
-				return true
+		if info, err := upgradeStat(filepath.Join(string(filepath.Separator), "Applications", "ZCode.app")); err == nil && info.IsDir() {
-			}
+			return true
 		}
 	case ".minimax/skills":
-		if allowSystemApps {
+		if info, err := upgradeStat(filepath.Join(string(filepath.Separator), "Applications", "MiniMax Code.app")); err == nil && info.IsDir() {
-			if info, err := upgradeStat(filepath.Join(string(filepath.Separator), "Applications", "MiniMax Code.app")); err == nil && info.IsDir() {
+			return true
-				return true
-			}
 		}
 	}
 	info, err := upgradeStat(detectedDir)
@@ -738,7 +733,7 @@ func skillRootPathKey(path string) string {
 
 func hasDependentSkillRoot(homeDir, canonicalBase string) bool {
 	for _, root := range configuredSkillRoots(homeDir) {
-		if root.canonical || root.universal || isBlacklisted(root.label) || !skillRootDetectedBase(homeDir, root) {
+		if root.canonical || root.universal || isBlacklisted(root.label) || !skillRootDetectedBase(root) {
 			continue
 		}
 		if !samePhysicalSkillRoot(root.base, canonicalBase) {
@@ -848,7 +843,7 @@ func upgradeMonoSkillLocations(homeDir, skillSrc string) (*SkillUpgradeResult, e
 			result.Results = append(result.Results, SkillDirResult{Dir: destDir, Status: SkillDirBlacklisted})
 			continue
 		}
-		if !skillRootDetectedBase(homeDir, root) {
+		if !skillRootDetectedBase(root) {
 			result.Results = append(result.Results, SkillDirResult{Dir: destDir, Status: SkillDirSkipped})
 			continue
 		}
@@ -920,7 +915,7 @@ func upgradeMultiSkillLocations(homeDir, multiRoot string, skills []string) (*Sk
 			result.Results = append(result.Results, SkillDirResult{Dir: destBase, Status: SkillDirBlacklisted})
 			continue
 		}
-		if !skillRootDetectedBase(homeDir, root) {
+		if !skillRootDetectedBase(root) {
 			result.Results = append(result.Results, SkillDirResult{Dir: destBase, Status: SkillDirSkipped})
 			continue
 		}