fix: Use BeadsPath() for swarm status to read from git-synced beads (gt-1rxz5)

The swarm status was stale because bd commands were running from the rig
root path instead of the mayor/rig clone which has proper beads sync config.

Changes:
- Add Rig.BeadsPath() method to return mayor/rig path when available
- Update all bd commands in swarm.go to use BeadsPath()
- Update swarm manager to use separate beadsDir and gitDir paths
- beadsDir for bd commands (git-synced location)
- gitDir for git operations and mail (rig root)

This ensures swarm status reflects the latest beads data from the
git-synced beads-sync branch instead of stale local daemon data.

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

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

internal/rig/types.go

@@ -65,3 +65,14 @@ func (r *Rig) Summary() RigSummary {
 		HasRefinery:  r.HasRefinery,
 	}
 }
+
+// BeadsPath returns the path to use for beads operations.
+// Returns the mayor/rig clone path if available (has proper sync-branch config),
+// otherwise falls back to the rig root path.
+// This ensures beads commands read from a location with git-synced beads data.
+func (r *Rig) BeadsPath() string {
+	if r.HasMayor {
+		return r.Path + "/mayor/rig"
+	}
+	return r.Path
+}