test: add integration test for comfy node pack

[bigcat88]

End-to-end integration test for comfy node pack. Creates a real git repo with a pyproject.toml, tracked files, a .comfyignore, and an includes directory, then invokes the CLI and inspects the resulting zip.

Verifies five behaviors in one test: git-tracked files are included, .comfyignore patterns exclude files even when git-tracked, untracked files are excluded, [tool.comfy] includes directories are force-included even when not git-tracked, and the zip file itself is not recursively included.

The only thing mocked is the tracking consent prompt. Everything else runs through the real pipeline: CLI entry point, pyproject.toml parsing via extract_node_configuration, git ls-files, .comfyignore via pathspec, and zip_files.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #392      +/-   ##
==========================================
+ Coverage   74.22%   74.66%   +0.43%     
==========================================
  Files          33       33              
  Lines        3915     3915              
==========================================
+ Hits         2906     2923      +17     
+ Misses       1009      992      -17     

see 3 files with indirect coverage changes

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