Skip CLI construction for version-only invocations

[charliermarsh]

Summary

Skip executable-path resolution and full Clap command construction for the version-only uv --version and uv -V invocations. All other argument combinations continue through the existing parser, and both spellings have integration snapshot coverage.

Measurements

Profiling binaries, one pinned CPU, 100 warmups, and 500 alternating pairs:

Command	Before	After	Change (95% paired CI)
uv --version wall	9.15 ms	7.14 ms	-21.8% [-22.2%, -21.3%]
uv --version CPU	8.41 ms	6.42 ms	-23.6% [-24.0%, -23.3%]

The --help and representative basic-command controls were neutral, and output hashes matched.

Validation

• cargo clippy --locked -p uv --lib --tests --features test-python,test-pypi -- -D warnings
• cargo nextest run --locked -p uv --features test-python,test-pypi --test it -E 'test(version_flag)' --no-capture

[astral-sh-bot]

uv test inventory changes

This PR changes the tests when compared with the main base revision.

• Added tests: 1
• Removed tests: 0
• Changed suites: 1

uv::it: +1 / -0

Added:

• uv::it::version::version_flag

Removed: none