feat(fmt): add rs fmt command

[chenjiahan]

This PR makes rs fmt usable by connecting the existing formatter config, file discovery, and serial runner through a lazily loaded CLI adapter. It supports write, check, and list-different output with stable exit codes, keeps Prettier config and ignore files isolated from Rstack configuration, and treats empty results as a successful no-op. Parallel execution, persistent cache, and plugin resolution remain deferred.

[coderabbitai]

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Run ID: bfebb366-5913-4448-a3ee-2a6933466fd4

📥 Commits

Reviewing files that changed from the base of the PR and between b9ffdec and 62fffd1.

📒 Files selected for processing (4)

• README.md
• packages/rstack/src/cli/commands.ts
• packages/rstack/src/fmt/cli.ts
• packages/rstack/tests/cli/fmt/index.test.ts

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📝 Walkthrough

Walkthrough

The change adds rs fmt to CLI help and command dispatch. The formatter CLI now loads and resolves configuration, discovers files, executes formatting, reports file results, supports check-mode summaries, and sets exit codes. Integration tests cover formatting behavior, configuration and ignore rules, reporting modes, errors, and empty file matches. The README updates the command description.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/feat-fmt-command

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