fix: stop writing Gas Town context to CLAUDE.md

gt crew add was overwriting project CLAUDE.md with Gas Town crew context.
This caused Gas Town internals to leak into project repos when workers
committed and pushed.

Gas Town context is now injected ephemerally via SessionStart hook (gt prime)
only, never written to tracked files.

internal/crew/manager.go

@@ -11,7 +11,6 @@ import (
 
 	"github.com/steveyegge/gastown/internal/git"
 	"github.com/steveyegge/gastown/internal/rig"
-	"github.com/steveyegge/gastown/internal/templates"
 	"github.com/steveyegge/gastown/internal/util"
 )
 
@@ -105,11 +104,10 @@ func (m *Manager) Add(name string, createBranch bool) (*CrewWorker, error) {
 		fmt.Printf("Warning: could not set up shared beads: %v\n", err)
 	}
 
-	// Create CLAUDE.md with crew worker prompting
-	if err := m.createClaudeMD(name, crewPath); err != nil {
-		_ = os.RemoveAll(crewPath) // best-effort cleanup
-		return nil, fmt.Errorf("creating CLAUDE.md: %w", err)
-	}
+	// NOTE: We intentionally do NOT write to CLAUDE.md here.
+	// Gas Town context is injected ephemerally via SessionStart hook (gt prime).
+	// Writing to CLAUDE.md would overwrite project instructions and leak
+	// Gas Town internals into the project repo when workers commit/push.
 
 	// Create crew worker state
 	now := time.Now()
@@ -131,69 +129,6 @@ func (m *Manager) Add(name string, createBranch bool) (*CrewWorker, error) {
 	return crew, nil
 }
 
-// createClaudeMD creates the CLAUDE.md file for crew worker prompting.
-// Uses the crew template from internal/templates for comprehensive context.
-func (m *Manager) createClaudeMD(name, crewPath string) error {
-	// Try to use templates for comprehensive crew context
-	tmpl, err := templates.New()
-	if err != nil {
-		// Fall back to minimal content if templates fail
-		return m.createClaudeMDFallback(name, crewPath)
-	}
-
-	// Find town root by walking up from rig path
-	townRoot := filepath.Dir(m.rig.Path)
-
-	// Build template data
-	data := templates.RoleData{
-		Role:     "crew",
-		RigName:  m.rig.Name,
-		TownRoot: townRoot,
-		WorkDir:  crewPath,
-		Polecat:  name, // Used for crew member name
-	}
-
-	// Render the crew template
-	content, err := tmpl.RenderRole("crew", data)
-	if err != nil {
-		// Fall back if rendering fails
-		return m.createClaudeMDFallback(name, crewPath)
-	}
-
-	claudePath := filepath.Join(crewPath, "CLAUDE.md")
-	return os.WriteFile(claudePath, []byte(content), 0644)
-}
-
-// createClaudeMDFallback creates a minimal CLAUDE.md if templates fail.
-func (m *Manager) createClaudeMDFallback(name, crewPath string) error {
-	content := fmt.Sprintf(`# Claude: Crew Worker - %s
-
-Run `+"`gt prime`"+` for full crew worker context.
-
-You are a **crew worker** in the %s rig. Crew workers are user-managed persistent workspaces.
-
-## Key Differences from Polecats
-
-- **User-managed**: You are NOT managed by the Witness daemon
-- **Persistent**: Your workspace is not automatically cleaned up
-- **Long-lived identity**: You keep your name across sessions
-- **Mail enabled**: You can send and receive mail
-
-## Key Commands
-
-- `+"`gt prime`"+` - Output full crew worker context
-- `+"`gt mail inbox`"+` - Check your inbox
-- `+"`bd ready`"+` - Available issues (if beads configured)
-- `+"`bd show <id>`"+` - View issue details
-- `+"`bd close <id>`"+` - Mark issue complete
-
-Crew: %s | Rig: %s
-`, name, m.rig.Name, name, m.rig.Name)
-
-	claudePath := filepath.Join(crewPath, "CLAUDE.md")
-	return os.WriteFile(claudePath, []byte(content), 0644)
-}
-
 // Remove deletes a crew worker.
 func (m *Manager) Remove(name string, force bool) error {
 	if !m.exists(name) {