Update CLI description, help/version options, and add version command

src/cli.ts

@@ -1,6 +1,7 @@
 #!/usr/bin/env bun
 
-import { Command } from "commander"
+import { Command, Option } from "commander"
+import { yellow, reset } from "./fmt.ts"
 import * as git from "./git.ts"
 import * as state from "./state.ts"
 import { action as newAction } from "./commands/new.ts"
@@ -25,7 +26,18 @@ const pkg = await Bun.file(new URL("../package.json", import.meta.url)).json()
 
 const program = new Command()
 
-program.name("sandlot").description("Branch-based development with git worktrees and Apple Container").version(pkg.version)
+program
+  .name("sandlot")
+  .description("Sandboxed development with Claude.")
+  .configureHelp({ styleTitle: (str) => `${yellow}${str}${reset}` })
+  .helpOption(false)
+  .addOption(new Option("-h, --help").hideHelp())
+  .on("option:help", () => program.help())
+  .addOption(new Option("-V, --version").hideHelp())
+  .on("option:version", () => {
+    console.log(pkg.version)
+    process.exit(0)
+  })
 
 // ── Sessions ────────────────────────────────────────────────────────
 
@@ -50,7 +62,7 @@ program
   .argument("[prompt]", "initial prompt for Claude")
   .option("-p, --print <prompt>", "run Claude in non-interactive mode with -p")
   .option("-n, --no-save", "skip auto-save after Claude exits")
-  .description("Re-enter an existing session")
+  .description("Open an existing Claude session")
   .action(openAction)
 
 program
@@ -144,6 +156,13 @@ program
 
 registerVmCommands(program)
 
+program
+  .command("version")
+  .description("Print the version number")
+  .action(() => {
+    console.log(pkg.version)
+  })
+
 program
   .command("completions")
   .option("--install", "Output a shell script that installs the completions file")