* feat(rules-injector): add GitHub Copilot instructions format support
- Add .github/instructions/ directory to rule discovery paths
- Add applyTo as alias for globs field in frontmatter parser
- Support .github/copilot-instructions.md single-file format (always-apply)
- Filter .github/instructions/ to only accept *.instructions.md files
- Add comprehensive tests for parser and finder
Closes#397
* fix(rules-injector): use cross-platform path separator in calculateDistance
path.relative() returns OS-native separators (backslashes on Windows),
but the code was splitting by forward slash only, causing incorrect
distance calculations on Windows.
Use regex /[/\]/ to handle both separator types.
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Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>