feat(crew): Provision .claude/commands/ for crew and polecat workspaces (gt-jhr85)

When adding a crew member with 'gt crew add' or spawning a polecat,
provision the .claude/commands/ directory with standard slash commands
like /handoff. This ensures all agents have Gas Town utilities even if
the source repo does not have them tracked.

Changes:
- Add embedded commands templates (internal/templates/commands/)
- Add ProvisionCommands() to templates package
- Call ProvisionCommands from crew and polecat managers
- Add gt doctor commands-provisioned check with --fix support

internal/polecat/manager.go

@@ -12,6 +12,7 @@ import (
 	"github.com/steveyegge/gastown/internal/config"
 	"github.com/steveyegge/gastown/internal/git"
 	"github.com/steveyegge/gastown/internal/rig"
+	"github.com/steveyegge/gastown/internal/templates"
 	"github.com/steveyegge/gastown/internal/workspace"
 )
 
@@ -244,6 +245,13 @@ func (m *Manager) AddWithOptions(name string, opts AddOptions) (*Polecat, error)
 		fmt.Printf("Warning: could not set up shared beads: %v\n", err)
 	}
 
+	// Provision .claude/commands/ with standard slash commands (e.g., /handoff)
+	// This ensures polecats have Gas Town utilities even if source repo lacks them.
+	if err := templates.ProvisionCommands(polecatPath); err != nil {
+		// Non-fatal - polecat can still work, warn but don't fail
+		fmt.Printf("Warning: could not provision slash commands: %v\n", err)
+	}
+
 	// Create agent bead for ZFC compliance (self-report state).
 	// State starts as "spawning" - will be updated to "working" when Claude starts.
 	// HookBead is set atomically at creation time if provided (avoids cross-beads routing issues).
@@ -460,6 +468,11 @@ func (m *Manager) RecreateWithOptions(name string, force bool, opts AddOptions)
 		fmt.Printf("Warning: could not set up shared beads: %v\n", err)
 	}
 
+	// Provision .claude/commands/ with standard slash commands (e.g., /handoff)
+	if err := templates.ProvisionCommands(polecatPath); err != nil {
+		fmt.Printf("Warning: could not provision slash commands: %v\n", err)
+	}
+
 	// Create fresh agent bead for ZFC compliance
 	// HookBead is set atomically at recreation time if provided.
 	_, err = m.beads.CreateAgentBead(agentID, agentID, &beads.AgentFields{