feat: Add C-b n/p keybindings for crew session cycling

When multiple crew sessions exist in the same rig, C-b n cycles to next
and C-b p cycles to previous. Sessions are sorted alphabetically and
wrap around.

Implementation:
- crew_cycle.go: Hidden `gt crew next/prev` commands for tmux to call
- crew_helpers.go: parseCrewSessionName and findRigCrewSessions helpers
- crew_at.go: Calls SetCrewCycleBindings on session creation

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

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

internal/cmd/crew.go

@@ -198,33 +198,17 @@ Examples:
 }
 
 var crewNextCmd = &cobra.Command{
-	Use:   "next",
-	Short: "Switch to next crew session in same rig",
-	Long: `Switch to the next crew session in the same rig.
-
-Cycles through crew sessions alphabetically. When you reach the last
-crew, wraps around to the first.
-
-This command is bound to C-b n in crew sessions for quick switching.
-
-Examples:
-  gt crew next                    # Switch to next crew in same rig`,
-	RunE: runCrewNext,
+	Use:    "next",
+	Short:  "Switch to next crew session in same rig",
+	Hidden: true, // Internal command for tmux keybindings
+	RunE:   runCrewNext,
 }
 
 var crewPrevCmd = &cobra.Command{
-	Use:   "prev",
-	Short: "Switch to previous crew session in same rig",
-	Long: `Switch to the previous crew session in the same rig.
-
-Cycles through crew sessions in reverse alphabetical order. When you
-reach the first crew, wraps around to the last.
-
-This command is bound to C-b p in crew sessions for quick switching.
-
-Examples:
-  gt crew prev                    # Switch to previous crew in same rig`,
-	RunE: runCrewPrev,
+	Use:    "prev",
+	Short:  "Switch to previous crew session in same rig",
+	Hidden: true, // Internal command for tmux keybindings
+	RunE:   runCrewPrev,
 }
 
 func init() {

internal/cmd/crew_at.go

@@ -103,6 +103,9 @@ func runCrewAt(cmd *cobra.Command, args []string) error {
 		theme := getThemeForRig(r.Name)
 		_ = t.ConfigureGasTownSession(sessionID, theme, r.Name, name, "crew")
 
+		// Set up C-b n/p keybindings for crew session cycling
+		_ = t.SetCrewCycleBindings(sessionID)
+
 		// Wait for shell to be ready after session creation
 		if err := t.WaitForShellReady(sessionID, 5*time.Second); err != nil {
 			return fmt.Errorf("waiting for shell: %w", err)

internal/cmd/crew_cycle.go

@@ -11,8 +11,11 @@ import (
 // cycleCrewSession switches to the next or previous crew session in the same rig.
 // direction: 1 for next, -1 for previous
 func cycleCrewSession(direction int) error {
-	// Get current session
-	currentSession := getCurrentTmuxSession()
+	// Get current session (uses existing function from handoff.go)
+	currentSession, err := getCurrentTmuxSession()
+	if err != nil {
+		return fmt.Errorf("not in a tmux session: %w", err)
+	}
 	if currentSession == "" {
 		return fmt.Errorf("not in a tmux session")
 	}
@@ -55,7 +58,6 @@ func cycleCrewSession(direction int) error {
 
 	if targetIdx == currentIdx {
 		// Only one session, nothing to switch to
-		fmt.Printf("Only one crew session in rig %s\n", rigName)
 		return nil
 	}
 

internal/cmd/crew_helpers.go

@@ -268,22 +268,6 @@ func parseCrewSessionName(sessionName string) (rigName, crewName string, ok bool
 	return rigName, crewName, true
 }
 
-// getCurrentTmuxSession returns the current tmux session name.
-// Returns empty string if not in tmux.
-func getCurrentTmuxSession() string {
-	if os.Getenv("TMUX") == "" {
-		return ""
-	}
-
-	cmd := exec.Command("tmux", "display-message", "-p", "#{session_name}")
-	out, err := cmd.Output()
-	if err != nil {
-		return ""
-	}
-
-	return strings.TrimSpace(string(out))
-}
-
 // findRigCrewSessions returns all crew sessions for a given rig, sorted alphabetically.
 // Uses tmux list-sessions to find sessions matching gt-<rig>-crew-* pattern.
 func findRigCrewSessions(rigName string) ([]string, error) {