feat: Unified beads redirect for tracked and local beads (#222)

* feat: Beads redirect architecture for tracked and local beads

This change implements proper redirect handling so that all rig agents
(Witness, Refinery, Crew, Polecats) can work with both:
- Tracked beads: .beads/ checked into git at mayor/rig/.beads
- Local beads: .beads/ created at rig root during gt rig add

Key changes:

1. SetupRedirect now handles tracked beads by skipping redirect chains.
   The bd CLI doesn't support chains (A→B→C), so worktrees redirect
   directly to the final destination (mayor/rig/.beads for tracked).

2. ResolveBeadsDir is now used consistently in polecat and refinery
   managers instead of hardcoded mayor/rig paths.

3. Rig-level agents (witness, refinery) now use rig beads with rig
   prefix instead of town beads. This follows the architecture where
   town beads are only for Mayor/Deacon.

4. prime.go simplified to always use ../../.beads for crew redirects,
   letting rig-level redirect handle tracked vs local routing.

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

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

* feat(doctor): Add beads-redirect check for tracked beads

When a repo has .beads/ tracked in git (at mayor/rig/.beads), the rig root
needs a redirect file pointing to that location. This check:

- Detects missing rig-level redirect for tracked beads
- Verifies redirect points to correct location (mayor/rig/.beads)
- Auto-fixes with 'gt doctor --fix'

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

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

* fix: Handle fileLock.Unlock error in daemon

Wrap fileLock.Unlock() return value to satisfy errcheck linter.

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

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

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

internal/rig/manager.go

@@ -367,6 +367,14 @@ func (m *Manager) AddRig(opts AddRigOptions) (*Rig, error) {
 		return nil, fmt.Errorf("creating mayor CLAUDE.md: %w", err)
 	}
 
+	// Initialize beads at rig level BEFORE creating worktrees.
+	// This ensures rig/.beads exists so worktree redirects can point to it.
+	fmt.Printf("  Initializing beads database...\n")
+	if err := m.initBeads(rigPath, opts.BeadsPrefix); err != nil {
+		return nil, fmt.Errorf("initializing beads: %w", err)
+	}
+	fmt.Printf("   ✓ Initialized beads (prefix: %s)\n", opts.BeadsPrefix)
+
 	// Create refinery as worktree from bare repo on default branch.
 	// Refinery needs to see polecat branches (shared .repo.git) and merges them.
 	// Being on the default branch allows direct merge workflow.
@@ -379,6 +387,10 @@ func (m *Manager) AddRig(opts AddRigOptions) (*Rig, error) {
 		return nil, fmt.Errorf("creating refinery worktree: %w", err)
 	}
 	fmt.Printf("   ✓ Created refinery worktree\n")
+	// Set up beads redirect for refinery (points to rig-level .beads)
+	if err := beads.SetupRedirect(m.townRoot, refineryRigPath); err != nil {
+		fmt.Printf("  Warning: Could not set up refinery beads redirect: %v\n", err)
+	}
 	// Create refinery CLAUDE.md (overrides any from cloned repo)
 	if err := m.createRoleCLAUDEmd(refineryRigPath, "refinery", opts.Name, ""); err != nil {
 		return nil, fmt.Errorf("creating refinery CLAUDE.md: %w", err)
@@ -433,13 +445,6 @@ Use crew for your own workspace. Polecats are for batch work dispatch.
 		return nil, fmt.Errorf("creating polecats dir: %w", err)
 	}
 
-	// Initialize beads at rig level
-	fmt.Printf("  Initializing beads database...\n")
-	if err := m.initBeads(rigPath, opts.BeadsPrefix); err != nil {
-		return nil, fmt.Errorf("initializing beads: %w", err)
-	}
-	fmt.Printf("   ✓ Initialized beads (prefix: %s)\n", opts.BeadsPrefix)
-
 	// Create rig-level agent beads (witness, refinery) in rig beads.
 	// Town-level agents (mayor, deacon) are created by gt install in town beads.
 	if err := m.initAgentBeads(rigPath, opts.Name, opts.BeadsPrefix); err != nil {
@@ -508,6 +513,23 @@ func (m *Manager) initBeads(rigPath, prefix string) error {
 	}
 
 	beadsDir := filepath.Join(rigPath, ".beads")
+	mayorRigBeads := filepath.Join(rigPath, "mayor", "rig", ".beads")
+
+	// Check if source repo has tracked .beads/ (cloned into mayor/rig).
+	// If so, create a redirect file instead of a new database.
+	if _, err := os.Stat(mayorRigBeads); err == nil {
+		// Tracked beads exist - create redirect to mayor/rig/.beads
+		if err := os.MkdirAll(beadsDir, 0755); err != nil {
+			return err
+		}
+		redirectPath := filepath.Join(beadsDir, "redirect")
+		if err := os.WriteFile(redirectPath, []byte("mayor/rig/.beads\n"), 0644); err != nil {
+			return fmt.Errorf("creating redirect file: %w", err)
+		}
+		return nil
+	}
+
+	// No tracked beads - create local database
 	if err := os.MkdirAll(beadsDir, 0755); err != nil {
 		return err
 	}
@@ -572,7 +594,8 @@ func (m *Manager) initBeads(rigPath, prefix string) error {
 func (m *Manager) initAgentBeads(rigPath, rigName, prefix string) error {
 	// Rig-level agents go in rig beads with rig prefix (per docs/architecture.md).
 	// Town-level agents (Mayor, Deacon) are created by gt install in town beads.
-	rigBeadsDir := filepath.Join(rigPath, ".beads")
+	// Use ResolveBeadsDir to follow redirect files for tracked beads.
+	rigBeadsDir := beads.ResolveBeadsDir(rigPath)
 	bd := beads.NewWithBeadsDir(rigPath, rigBeadsDir)
 
 	// Define rig-level agents to create