feat: print version and exit on --version

[CorticalCode]

Summary

ccstatusline --version currently launches the interactive TUI instead of reporting the version. The entry point only branches on --hook and then TTY-vs-piped mode, so an unrecognized flag falls through to the TUI. This adds a --version check at the top of main() that prints the version and exits, which is the expected behavior for a CLI/TUI.

Closes #461.

Approach

A single guard before mode detection in src/ccstatusline.ts, reusing the existing getPackageVersion() helper from src/utils/terminal.ts:

• getPackageVersion() returns the build-substituted version and falls back to reading package.json, so --version is correct both from the published build and when run from source.
• No new dependency, and it is consistent with the existing manual --config / --hook argument handling.

Test plan

• bun run lint passes (tsc + eslint, --max-warnings=0).
• --version prints the version and exits 0:
  • from source: bun run src/ccstatusline.ts --version -> 2.2.22
  • from the built artifact: node dist/ccstatusline.js --version -> 2.2.22
• Piped status-line rendering is unchanged (the guard runs and returns before mode detection); the TUI still launches with no args.

[sirmalloc]

Thanks, it'll go out in the next release.