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.

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

---------

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

internal/refinery/manager.go

@@ -179,7 +179,8 @@ func (m *Manager) Start(foreground bool) error {
 	_ = t.SetEnvironment(sessionID, "BD_ACTOR", bdActor)
 
 	// Set beads environment - refinery uses rig-level beads (non-fatal)
-	beadsDir := filepath.Join(m.rig.Path, "mayor", "rig", ".beads")
+	// Use ResolveBeadsDir to handle both tracked (mayor/rig) and local beads
+	beadsDir := beads.ResolveBeadsDir(m.rig.Path)
 	_ = t.SetEnvironment(sessionID, "BEADS_DIR", beadsDir)
 	_ = t.SetEnvironment(sessionID, "BEADS_NO_DAEMON", "1")
 	_ = t.SetEnvironment(sessionID, "BEADS_AGENT_NAME", fmt.Sprintf("%s/refinery", m.rig.Name))