Print CLI errors as one line instead of a stack trace (closes #102)

An error a command throws now reaches the user as one `quak: MESSAGE`
line on stderr, and the CLI exits 1 once output has drained. The wrapper
moved from bin/quak.ts to src/cli-run.ts so it can be tested, and
bin/quak.ts awaits program.parseAsync() so async actions are awaited.

Model: opus-5-5

src/cli-commands.ts

@@ -2,8 +2,9 @@
 //
 // Each command takes its options and a `CliContext` and resolves to the exit
 // code; a thrown error is left to the caller. Nothing here calls
-// `process.exit`: `bin/quak.ts` wires these to the command line and exits with
-// the returned code once output has drained. Output must stay byte-identical
+// `process.exit`: `bin/quak.ts` wires these to the command line, and `run` in
+// `cli-run.ts` prints a thrown error as one line and exits once output has
+// drained. Output must stay byte-identical
 // (see `cli-output.ts`).
 
 import { input, password as passwordPrompt } from "@inquirer/prompts";