fix: SetupRedirect now works with tracked beads architecture

The SetupRedirect function was failing for rigs that use the tracked
beads architecture where the canonical beads location is mayor/rig/.beads
and there is no rig-level .beads directory.

This fix now checks for both locations:
1. rig/.beads (with optional redirect to mayor/rig/.beads)
2. mayor/rig/.beads directly (if no rig/.beads exists)

This ensures crew and polecat workspaces get the correct redirect file
pointing to the shared beads database in all configurations.

Closes: gt-jy77g

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

internal/beads/beads.go

@@ -161,9 +161,10 @@ func cleanBeadsRuntimeFiles(beadsDir string) {
 //   - worktreePath: the worktree directory (e.g., <rig>/crew/<name> or <rig>/refinery/rig)
 //
 // The function:
-//  1. Computes the relative path from worktree to rig-level .beads
-//  2. Cleans up runtime files (preserving tracked files like formulas/)
-//  3. Creates the redirect file
+//  1. Finds the canonical beads location (rig/.beads or mayor/rig/.beads)
+//  2. Computes the relative path from worktree to that location
+//  3. Cleans up runtime files (preserving tracked files like formulas/)
+//  4. Creates the redirect file
 //
 // Safety: This function refuses to create redirects in the canonical beads location
 // (mayor/rig) to prevent circular redirect chains.
@@ -186,10 +187,47 @@ func SetupRedirect(townRoot, worktreePath string) error {
 	}
 
 	rigRoot := filepath.Join(townRoot, parts[0])
-	rigBeadsPath := filepath.Join(rigRoot, ".beads")
 
-	if _, err := os.Stat(rigBeadsPath); os.IsNotExist(err) {
-		return fmt.Errorf("no rig .beads found at %s", rigBeadsPath)
+	// Find the canonical beads location. In order of preference:
+	// 1. rig/.beads (if it exists and has content or a redirect)
+	// 2. mayor/rig/.beads (tracked beads architecture)
+	//
+	// The tracked beads architecture stores the actual database in mayor/rig/.beads
+	// and may not have a rig/.beads directory at all.
+	rigBeadsPath := filepath.Join(rigRoot, ".beads")
+	mayorBeadsPath := filepath.Join(rigRoot, "mayor", "rig", ".beads")
+
+	// Compute depth for relative paths
+	// e.g., crew/<name> (depth 2) -> ../../
+	//       refinery/rig (depth 2) -> ../../
+	depth := len(parts) - 1 // subtract 1 for rig name itself
+	upPath := strings.Repeat("../", depth)
+
+	var redirectPath string
+
+	// Check if rig-level .beads exists
+	if _, err := os.Stat(rigBeadsPath); err == nil {
+		// rig/.beads exists - check if it has a redirect to follow
+		rigRedirectPath := filepath.Join(rigBeadsPath, "redirect")
+		if data, err := os.ReadFile(rigRedirectPath); err == nil {
+			rigRedirectTarget := strings.TrimSpace(string(data))
+			if rigRedirectTarget != "" {
+				// Rig has redirect (e.g., "mayor/rig/.beads" for tracked beads).
+				// Redirect worktree directly to the final destination.
+				redirectPath = upPath + rigRedirectTarget
+			}
+		}
+		// If no redirect in rig/.beads, point directly to rig/.beads
+		if redirectPath == "" {
+			redirectPath = upPath + ".beads"
+		}
+	} else if _, err := os.Stat(mayorBeadsPath); err == nil {
+		// No rig/.beads but mayor/rig/.beads exists (tracked beads architecture).
+		// Point directly to mayor/rig/.beads.
+		redirectPath = upPath + "mayor/rig/.beads"
+	} else {
+		// Neither location exists - this is an error
+		return fmt.Errorf("no beads found at %s or %s", rigBeadsPath, mayorBeadsPath)
 	}
 
 	// Clean up runtime files in .beads/ but preserve tracked files (formulas/, README.md, etc.)
@@ -201,25 +239,6 @@ func SetupRedirect(townRoot, worktreePath string) error {
 		return fmt.Errorf("creating .beads dir: %w", err)
 	}
 
-	// Compute relative path from worktree to rig root
-	// e.g., crew/<name> (depth 2) -> ../../.beads
-	//       refinery/rig (depth 2) -> ../../.beads
-	depth := len(parts) - 1 // subtract 1 for rig name itself
-	redirectPath := strings.Repeat("../", depth) + ".beads"
-
-	// Check if rig-level beads has a redirect (tracked beads case).
-	// If so, redirect directly to the final destination to avoid chains.
-	// The bd CLI doesn't support redirect chains, so we must skip intermediate hops.
-	rigRedirectPath := filepath.Join(rigBeadsPath, "redirect")
-	if data, err := os.ReadFile(rigRedirectPath); err == nil {
-		rigRedirectTarget := strings.TrimSpace(string(data))
-		if rigRedirectTarget != "" {
-			// Rig has redirect (e.g., "mayor/rig/.beads" for tracked beads).
-			// Redirect worktree directly to the final destination.
-			redirectPath = strings.Repeat("../", depth) + rigRedirectTarget
-		}
-	}
-
 	// Create redirect file
 	redirectFile := filepath.Join(worktreeBeadsDir, "redirect")
 	if err := os.WriteFile(redirectFile, []byte(redirectPath+"\n"), 0644); err != nil {