fix: doctor checks follow redirect for Gas Town support (bd-tvus)

Extended bd-tvus fix to all doctor check functions that access .beads/
directory. In Gas Town multi-clone setups, crew/polecat clones use
.beads/redirect files to point to the shared mayor/rig beads directory.

Doctor checks now use resolveBeadsDir() to follow these redirects:
- daemon.go: CheckDaemonStatus
- git.go: CheckSyncBranchConfig, FindOrphanedIssues, CheckOrphanedIssues
- installation.go: CheckMultipleDatabases, CheckPermissions
- integrity.go: CheckIDFormat, CheckDependencyCycles, CheckTombstones,
  CheckDeletionsManifest, CheckRepoFingerprint
- jsonl_integrity.go: CheckJSONLIntegrity
- legacy.go: CheckFreshClone
- maintenance.go: CheckStaleClosedIssues, CheckExpiredTombstones,
  CheckCompactionCandidates
- perf.go: RunPerformanceDiagnostics, CollectPlatformInfo
- validation.go: CheckMergeArtifacts, CheckOrphanedDependencies,
  CheckDuplicateIssues, CheckTestPollution, CheckChildParentDependencies,
  CheckGitConflicts
- version.go: CheckMetadataVersionTracking

Intentionally NOT changed (check local files):
- CheckInstallation: checks local .beads/ exists
- CheckUntrackedBeadsFiles: checks git tracking of local files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/doctor/validation.go

@@ -17,7 +17,8 @@ import (
 // CheckMergeArtifacts detects temporary git merge files in .beads directory.
 // These are created during git merges and should be cleaned up.
 func CheckMergeArtifacts(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 
 	if _, err := os.Stat(beadsDir); os.IsNotExist(err) {
 		return DoctorCheck{
@@ -109,7 +110,8 @@ func readMergeArtifactPatterns(beadsDir string) ([]string, error) {
 
 // CheckOrphanedDependencies detects dependencies pointing to non-existent issues.
 func CheckOrphanedDependencies(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 	dbPath := filepath.Join(beadsDir, beads.CanonicalDatabaseName)
 
 	if _, err := os.Stat(dbPath); os.IsNotExist(err) {
@@ -180,7 +182,8 @@ func CheckOrphanedDependencies(path string) DoctorCheck {
 
 // CheckDuplicateIssues detects issues with identical content.
 func CheckDuplicateIssues(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 	dbPath := filepath.Join(beadsDir, beads.CanonicalDatabaseName)
 
 	if _, err := os.Stat(dbPath); os.IsNotExist(err) {
@@ -250,7 +253,8 @@ func CheckDuplicateIssues(path string) DoctorCheck {
 
 // CheckTestPollution detects test issues that may have leaked into the database.
 func CheckTestPollution(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 	dbPath := filepath.Join(beadsDir, beads.CanonicalDatabaseName)
 
 	if _, err := os.Stat(dbPath); os.IsNotExist(err) {
@@ -312,7 +316,8 @@ func CheckTestPollution(path string) DoctorCheck {
 // These often indicate a modeling mistake (deadlock: child waits for parent, parent waits for children).
 // However, they may be intentional in some workflows, so removal requires explicit opt-in.
 func CheckChildParentDependencies(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 	dbPath := filepath.Join(beadsDir, beads.CanonicalDatabaseName)
 
 	if _, err := os.Stat(dbPath); os.IsNotExist(err) {
@@ -386,7 +391,8 @@ func CheckChildParentDependencies(path string) DoctorCheck {
 
 // CheckGitConflicts detects git conflict markers in JSONL file.
 func CheckGitConflicts(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 	jsonlPath := filepath.Join(beadsDir, "issues.jsonl")
 
 	if _, err := os.Stat(jsonlPath); os.IsNotExist(err) {