[Nicolas Palpacuer (NickPPC)]

Summary

Add a lint job running ruff check and ruff format --check to the existing Build & Test workflow, which already compiles, imports and builds the binary on every PR and push to main. The existing check and build jobs are unchanged.

Changes

• New lint job in test.yml: ruff check + ruff format --check via astral-sh/ruff-action pinned by SHA to v4.1.0, ruff 0.17.0
• ruff.toml restricts lint to pyflakes, pycodestyle errors and import sorting, with line-length = 120 (formatting diff 75+/32- vs 153+/44- at the default 88)
• ruff format commit: 3 files, whitespace and quotes only
• Import commit: sorted imports, dropped 2 unused imports (time, odrive in utils.py); the OdriveSerial import in main.py is kept with # noqa: F401 because it registers the model
• from odrive.enums import * replaced with the 4 enums used (AxisState, ControlMode, InputMode, ODriveError; checked against the odrive 0.6.10.post0 wheel), plus one placeholder-less f-string
• No overlap with martha/pr-tests: that branch is the one merged as Add test.yml workflow #25, which added test.yml; nothing else is in flight
• Follow-up: the repo has no pytest suite, so no test step was added

Testing

• Locally: ruff check and format are clean at 0.17.0, and every local import in src resolves.
• The check, build and lint jobs on this PR verify the deps still import and the binary still builds after the import changes.

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