[somewhatabstract]

This groups the clean-room glob matcher and gitignore handling into two submodules of checksync-core. That way they're already shaped like separate crates, ready to be split out later. They follow the existing errors.rs and errors/ pattern. Behaviour doesn't change: this only moves and renames.

• glob: the matcher files, with their own glob/types.rs. The module uses nothing else from the crate. It exposes only compile_glob, compiled_glob_matches, GlobOptions, CompiledGlob and bytes_before_nul.
• gitignore: pattern parsing, matching, IgnoreFile, and gitignore/types.rs. The module path replaces the old gitignore_ prefixes. It uses glob only through what glob.rs exposes. IgnoreFile is still re-exported as checksync_core::IgnoreFile.

To lift gitignore out as its own crate later, IgnoreDecision and the path helpers it uses (node_relative, node_normalize, and normalize_separators on Windows) would need to move with it or into a shared crate. glob could be lifted out as it is.

The clean-room agent that wrote both made the move, so the code stays its own work. Part of #2615.

Test plan

• Every existing test passes unchanged, including the glob vectors and ignore-vectors.json.

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Generated by Claude Code

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2131c61) to head (69cbdb4).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2707   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          111       112    +1     
  Lines         3830      3843   +13     
  Branches      3038      3051   +13     
=========================================
+ Hits          3830      3843   +13     

Flag	Coverage Δ
rust	100.00% <100.00%> (ø)
typescript	100.00% <ø> (ø)

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Files with missing lines	Coverage Δ
...s/checksync-core/src/gitignore/bytes_before_nul.rs	100.00% <100.00%> (ø)
...crates/checksync-core/src/gitignore/decide_path.rs	100.00% <100.00%> (ø)
...crates/checksync-core/src/gitignore/ignore_file.rs	100.00% <100.00%> (ø)
.../crates/checksync-core/src/gitignore/last_match.rs	100.00% <100.00%> (ø)
rust/crates/checksync-core/src/gitignore/parse.rs	100.00% <100.00%> (ø)
.../crates/checksync-core/src/gitignore/parse_line.rs	100.00% <100.00%> (ø)
...es/checksync-core/src/gitignore/pattern_matches.rs	100.00% <100.00%> (ø)
...ates/checksync-core/src/gitignore/relative_path.rs	100.00% <100.00%> (ø)
...ecksync-core/src/gitignore/trim_trailing_spaces.rs	100.00% <100.00%> (ø)
...tes/checksync-core/src/glob/advance_any_folders.rs	100.00% <100.00%> (ø)
... and 19 more

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