feat: Auto-detect crew name in gt crew start from cwd

When run from inside a crew directory like gastown/crew/joe, the command
now auto-detects the crew workspace name instead of requiring it as an
argument. This matches the existing behavior of 'gt crew at'.

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

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

internal/cmd/crew.go

@@ -233,7 +233,7 @@ var crewPrevCmd = &cobra.Command{
 }
 
 var crewStartCmd = &cobra.Command{
-	Use:   "start <name>",
+	Use:   "start [name]",
 	Short: "Start a crew workspace (creates if needed)",
 	Long: `Start a crew workspace, creating it if it doesn't exist.
 
@@ -243,11 +243,17 @@ The crew session starts in the background with Claude running and ready.
 The name can include the rig in slash format (e.g., gastown/joe).
 If not specified, the rig is inferred from the current directory.
 
+Role Discovery:
+  If no name is provided, attempts to detect the crew workspace from the
+  current directory. If you're in <rig>/crew/<name>/, it will start that
+  workspace automatically.
+
 Examples:
   gt crew start joe                    # Start joe in current rig
   gt crew start gastown/joe            # Start joe in gastown rig
-  gt crew start joe --rig beads        # Start joe in beads rig`,
-	Args: cobra.ExactArgs(1),
+  gt crew start joe --rig beads        # Start joe in beads rig
+  gt crew start                        # Auto-detect from cwd`,
+	Args: cobra.MaximumNArgs(1),
 	RunE: runCrewStart,
 }
 

internal/cmd/crew_lifecycle.go

@@ -158,16 +158,31 @@ func runCrewRefresh(cmd *cobra.Command, args []string) error {
 }
 
 // runCrewStart is an alias for runStartCrew, handling multiple input formats.
-// It supports: "name", "rig/name", and "rig/crew/name" formats.
+// It supports: "name", "rig/name", "rig/crew/name" formats, or auto-detection from cwd.
 func runCrewStart(cmd *cobra.Command, args []string) error {
-	name := args[0]
+	var name string
 
-	// Handle rig/crew/name format (e.g., "gastown/crew/joe" -> "gastown/joe")
-	if strings.Contains(name, "/crew/") {
-		parts := strings.SplitN(name, "/crew/", 2)
-		if len(parts) == 2 && parts[0] != "" && parts[1] != "" {
-			name = parts[0] + "/" + parts[1]
+	// Determine crew name: from arg, or auto-detect from cwd
+	if len(args) > 0 {
+		name = args[0]
+		// Handle rig/crew/name format (e.g., "gastown/crew/joe" -> "gastown/joe")
+		if strings.Contains(name, "/crew/") {
+			parts := strings.SplitN(name, "/crew/", 2)
+			if len(parts) == 2 && parts[0] != "" && parts[1] != "" {
+				name = parts[0] + "/" + parts[1]
+			}
 		}
+	} else {
+		// Try to detect from current directory
+		detected, err := detectCrewFromCwd()
+		if err != nil {
+			return fmt.Errorf("could not detect crew workspace from current directory: %w\n\nUsage: gt crew start <name>", err)
+		}
+		name = detected.crewName
+		if crewRig == "" {
+			crewRig = detected.rigName
+		}
+		fmt.Printf("Detected crew workspace: %s/%s\n", detected.rigName, name)
 	}
 
 	// Set the start.go flags from crew.go flags before calling