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/installation.go

@@ -40,7 +40,8 @@ func CheckInstallation(path string) DoctorCheck {
 
 // CheckMultipleDatabases checks for multiple database files in .beads directory
 func CheckMultipleDatabases(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 
 	// Find all .db files (excluding backups and vc.db)
 	files, err := filepath.Glob(filepath.Join(beadsDir, "*.db"))
@@ -88,7 +89,8 @@ func CheckMultipleDatabases(path string) DoctorCheck {
 
 // CheckPermissions verifies that .beads directory and database are readable/writable
 func CheckPermissions(path string) DoctorCheck {
-	beadsDir := filepath.Join(path, ".beads")
+	// Follow redirect to resolve actual beads directory (bd-tvus fix)
+	beadsDir := resolveBeadsDir(filepath.Join(path, ".beads"))
 
 	// Check if .beads/ is writable
 	testFile := filepath.Join(beadsDir, ".doctor-test-write")