Use more doc-related fields in script `--help, -h` output

[muzimuzhi]

Several documentation-related fields are only used in manpage and markdown docs, but not script --help, -h output. For example, the fields (before|after)_help, (before|after)_long_help, and example.

I encountered this when trying to show examples near the end of some script --help output.

IMHO, when a script learnt --help, -h options, one also expects its help output content as rich as a full doc.

[jdx]

Opened #554 to address this. The CLI help templates now render before_help, after_help, before_help_long, after_help_long, and examples in --help/-h output.

For short help (-h), it uses before_help/after_help. For long help (--help), it prefers the _long variants with fallback to the short ones. Examples are displayed with headers and $-prefixed commands.

This comment was generated by Claude Code.

[jdx]

Updated #554 to also include:

• version — shown as a name version header line at the top of both short and long help
• author and license — shown in the long help (--help) footer
• deprecated — shown as [deprecated: reason] next to subcommand names

This comment was generated by Claude Code.