compile_grep_include_glob

Compile a grep include-glob into a matcher with ripgrep-like semantics.

Provides one shared include-glob behavior for every backend so the same grep(..., glob=...) call closely mirrors ripgrep for common include patterns, whether or not ripgrep is installed:

• Patterns without a / match the basename at any depth.

  Example: *.py matches src/app/main.py.

• Patterns containing a / match the path relative to the grep search root, with ** support.

  Example: src/**/*.py matches src/app/main.py.

• A leading / anchors the pattern to the search root; it narrows the match rather than widening it.

  Example: /*.py matches top.py but not src/app/main.py.

Leading-dot names match only when the pattern segment itself starts with . (no DOTMATCH), and ** will not descend into dot-directories. A bare pattern is therefore broader than its **/ form: *.yml matches .github/workflows/ci.yml, while **/*.yml does not.

Exclusion/negation patterns (a leading !) are not supported: the ! is treated literally rather than inverting the match, so results for such patterns can diverge from rg --glob '!...'.

This is the single source of truth for both grep(..., glob=...) and backend glob().