feat(cli): agent-friendly CLI — non-interactive by default (#57)

* feat(cli): non-interactive by default, --human-friendly for UI

Following ElevenLabs CLI pattern: default mode is agent-friendly
(flag-driven, plain text output, fail fast on missing args).
Interactive clack UI is opt-in via --human-friendly.

Init command:
- --template required in default mode (errors with example if missing)
- --video / --audio flags for media input
- --skip-skills / --skip-transcribe to control optional steps
- --human-friendly enables the existing interactive prompts
- --help shows examples for every flag combination
- Transcription runs automatically in default mode (unless --skip-transcribe)
- Plain console.log output, process.exit(1) on errors

Skills command:
- Added --human-friendly flag
- Added examples to --help output

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(cli): improve --help documentation and add --yes/--check to upgrade

- upgrade: add --yes and --check flags to skip interactive prompt
- benchmark: clarify description — preset fps/quality/worker configs
- browser: describe each subcommand (ensure/path/clear) in help
- docs: list available topics inline in --help output

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/benchmark.ts

@@ -38,7 +38,7 @@ const DEFAULT_CONFIGS: BenchmarkConfig[] = [
 export default defineCommand({
   meta: {
     name: "benchmark",
-    description: "Run multiple render configurations and compare results",
+    description: "Render with preset fps/quality/worker configs and compare speed and file size",
   },
   args: {
     dir: { type: "positional", description: "Project directory", required: false },