Use ruff formatter in DABs templates (replacing Black) #4196
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There is a conflict with main remaining to resolve.
- Replace Black with Ruff for formatting and linting in pyproject.toml - Update VS Code settings to use Ruff extension with format on save - Configure Ruff with line-length 120 (matching repo and Workspace editor), recommended rules, and notebook support - Update README with lint commands - Apply to default-python, lakeflow-pipelines, and pydabs templates 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Ruff settings are already configured in pyproject.toml (line-length = 120), and the VS Code Ruff extension automatically picks up settings from pyproject.toml. There's no need to duplicate them in .vscode/settings.json. This simplifies the template by relying on Ruff defaults with only the line length as an exception. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
The README previously instructed users to run `uv run ruff check .` and `uv run ruff format .` manually. This is unnecessary since: - VS Code extension handles formatting automatically on save - The Makefile already has `make fmt` and `make lint` for the project maintainers - Users don't need to manually run linting tools 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
The `source.organizeImports` setting was added in the Black->Ruff migration but wasn't present in the original template. Removing it to keep the configuration minimal and match the original behavior where import organization is manual. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
- Restore "Finally," in README test instruction (was in original) - Restore trailing commas in .vscode/settings.json (was in original) - Keep diff minimal compared to main branch - only change what's necessary 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
The serverless-customcatalog test was showing a diff in .vscode/settings.json between the baseline and variant, but both should be identical since they use the same template. Running test-update-templates again fixed the consistency issue.
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Changes
This switches the code formatter to ruff and sets the line length to 120 a described in #3675.
Why
Tests