nvidia-holoscan / holoscan-cli / 30911671408

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feat: add -v/--version as top-level aliases for `holoscan version` (#219)

`version` is the only command implemented by `__main__` itself, reachable
only as a subcommand. Add `-v` and `--version` as top-level aliases so the
conventional spellings work too.

The flag routes to `execute_version_command` rather than argparse's built-in
`action="version"`, which would print a single string and exit. Routing to
the real handler keeps the output byte-identical to `holoscan version`
(Package / Version / Executable / Module).

The flag is declared on `parser` rather than `parent_parser`; the latter is
inherited via `parents=` by every subparser, which would otherwise produce
`holoscan build --version` and friends. The no-subcommand branch also has to
skip its print-help-and-exit path, which would otherwise swallow `holoscan -v`
before dispatch.

Note this claims `-v` for version, so it is no longer available as a short
form for the `--verbose` flag carried by the project subcommands.

Signed-off-by: Wenqi Li <wenqil@nvidia.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

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