fix(skills): compare Windows publication identity stably

internal/upgrade/skill_publication.go

@@ -42,12 +42,9 @@ func PublishSkillPathNoReplace(staged, destination string) (SkillPathPublication
 	if err != nil {
 		return SkillPathPublication{}, fmt.Errorf("确认已发布 Skill 内容失败 %s（对象保留）: %w", destination, err)
 	}
-	// Force os.SameFile to resolve and cache any path-backed identity (notably
-	// on Windows) while the just-published object is known to occupy the path.
-	if !os.SameFile(identity, publishedIdentity) || publishedFingerprint != fingerprint {
+	if !skillPathSameFileIdentity(identity, publishedIdentity) || publishedFingerprint != fingerprint {
 		return SkillPathPublication{}, fmt.Errorf("确认已发布 Skill 身份失败 %s（对象保留）: staging 身份已变化", destination)
 	}
-	_ = os.SameFile(publishedIdentity, publishedIdentity)
 	return SkillPathPublication{
 		Destination: destination,
 		fingerprint: fingerprint,
@@ -96,7 +93,7 @@ func rollbackSkillPathPublication(publication SkillPathPublication) (err error)
 			cleanupRoot(),
 		)
 	}
-	if publication.identity == nil || !os.SameFile(publication.identity, liveIdentity) ||
+	if publication.identity == nil || !skillPathSameFileIdentity(publication.identity, liveIdentity) ||
 		publication.incarnation != skillPathFileIncarnation(liveIdentity) ||
 		liveFingerprint != publication.fingerprint {
 		return errors.Join(
@@ -116,7 +113,7 @@ func rollbackSkillPathPublication(publication SkillPathPublication) (err error)
 	actualIdentity, identityErr := skillPathLstat(quarantine)
 	actual, fingerprintErr := fingerprintSkillPath(quarantine)
 	if identityErr == nil && fingerprintErr == nil &&
-		os.SameFile(publication.identity, actualIdentity) &&
+		skillPathSameFileIdentity(publication.identity, actualIdentity) &&
 		actual == publication.fingerprint {
 		if removeErr := removePublishedSkillSource(quarantine); removeErr != nil {
 			return fmt.Errorf("移除事务发布的 Skill 失败 %s（隔离于 %s）: %w", destination, quarantine, removeErr)