usethis format, usethis tool ruff, and usethis tool pyproject-fmt run formatters as a side effect when adding them. This adds a --no-apply flag to skip that step.

usethis tool ruff --no-apply      # configures ruff without running `ruff format`
usethis tool pyproject-fmt --no-apply  # configures pyproject-fmt without running it
usethis format --no-apply         # adds both formatters without running either

Changes

• _ui/options.py — New no_apply_opt Typer option
• _core/tool.py — no_apply param on use_ruff() and use_pyproject_fmt(), guarding tool.apply() calls
• _toolset/format_.py — no_apply param on use_formatters(), forwarded to both tool functions
• _ui/interface/format_.py, _ui/interface/tool.py — Wire --no-apply into the three CLI commands
• Tests — Core-level and CLI-level tests for all three commands verifying the formatter is skipped