[Enhancement]: Include commit SHA in -v/--version output for local builds

## Summary

Banner shows commit SHA `OpenClaw 2026.3.1 (b13e19b)` but `-v` only shows `2026.3.1`.

## Request

Include commit SHA in `-v` output for local/dev builds:

```bash
$ openclaw -v
OpenClaw 2026.3.1 (b13e19b)
```

## Motivation

- Consistency with banner
- Helps verify which local build is running

## Code

- `src/cli/program/help.ts:112`
- `src/cli/banner.ts:59-67`