feat: add subdirectories support

[luisfmsouza]

Summary

The goal of this pull request is adding support for rules nested into subdirectories (fixes #43 #56).

Please, point me for possible mistakes or things that I might be overlooking in the implementation.

Features

• Import rules that exist in .claude/rules/frontend/react.md into .rulesync/rules/frontend/react.md
• Generate rules from any subdirectory .rulesync/rules/**/*

Examples

rulesync	Cursor and Claude

Last words

Thanks for creating and supporting this package, I implemented this week and it has been very helpful for us.

[dyoshikawa]

@luisfmsouza

Thank you for this great contribution! The subdirectories support feature is a valuable addition.

Code Review Comment

Issue: process.cwd() hardcoding in rules-processor.ts

In the loadRulesyncFiles method, process.cwd() is used directly:

const rulesyncBaseDir = join(process.cwd(), RULESYNC_RULES_RELATIVE_DIR_PATH);

However, the RulesProcessor class has a this.baseDir property that should be used instead for better testability and design consistency.

Suggested fix:

const rulesyncBaseDir = join(this.baseDir, RULESYNC_RULES_RELATIVE_DIR_PATH);

This ensures that the base directory can be properly mocked in tests and maintains consistency with the existing class design.

[luisfmsouza]

Thanks @dyoshikawa for the feedback, I've fixed that 4364f4b

[dyoshikawa]

@luisfmsouza Thank you!