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/daemon/daemon.go

@@ -83,7 +83,7 @@ func (d *Daemon) Run() error {
 	if !locked {
 		return fmt.Errorf("daemon already running (lock held by another process)")
 	}
-	defer fileLock.Unlock()
+	defer func() { _ = fileLock.Unlock() }()
 
 	// Write PID file
 	if err := os.WriteFile(d.config.PidFile, []byte(strconv.Itoa(os.Getpid())), 0644); err != nil {