feat(crew): add resume prompt when restarting Claude

When `gt crew at` detects Claude has exited (shell running), or when
`gt crew restart` is used, now sends a crew-specific prompt after priming:

"Read your mail, act on anything urgent, else await instructions."

This gives crew workers clear direction on resume without requiring
manual prompting.

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

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

internal/cmd/crew.go

@@ -547,6 +547,11 @@ func runCrewAt(cmd *cobra.Command, args []string) error {
 			if err := t.SendKeys(sessionID, "gt prime"); err != nil {
 				fmt.Printf("Warning: Could not send prime command: %v\n", err)
 			}
+			// Send crew resume prompt after prime completes
+			crewPrompt := "Read your mail, act on anything urgent, else await instructions."
+			if err := t.SendKeysDelayed(sessionID, crewPrompt, 3000); err != nil {
+				fmt.Printf("Warning: Could not send resume prompt: %v\n", err)
+			}
 		}
 	}
 
@@ -815,6 +820,12 @@ func runCrewRestart(cmd *cobra.Command, args []string) error {
 		fmt.Printf("Warning: Could not send prime command: %v\n", err)
 	}
 
+	// Send crew resume prompt after prime completes
+	crewPrompt := "Read your mail, act on anything urgent, else await instructions."
+	if err := t.SendKeysDelayed(sessionID, crewPrompt, 3000); err != nil {
+		fmt.Printf("Warning: Could not send resume prompt: %v\n", err)
+	}
+
 	fmt.Printf("%s Restarted crew workspace: %s/%s\n",
 		style.Bold.Render("✓"), r.Name, name)
 	fmt.Printf("Attach with: %s\n", style.Dim.Render(fmt.Sprintf("gt crew at %s", name)))