fix: normalize generated hook line endings

[alirezanet]

Summary

• normalize generated shell hook content to LF line endings
• apply normalization when writing .husky/_/husky.sh and hook files created by set/add
• add regression tests for CRLF and standalone CR normalization

Test Plan

• dotnet test tests/HuskyTest/HuskyTest.csproj -v minimal
• sg docker -c 'dotnet test Husky.sln -v minimal'

Context

This prevents CRLF shebangs in generated hook scripts from breaking execution on Linux/WSL with errors like: fatal: cannot exec '.husky/pre-commit': No such file or directory

[what-the-diff]

PR Summary

• Standardized Line Endings in CreateResources Methods
  Updated the CreateResources and CreateResourcesAsync methods to normalize line endings. This change helps ensure consistency in line endings for the content read from a specific script, when writing the file either synchronously or asynchronously.

• Line Endings Normalization in CreateHook Method
  The CreateHook method now normalizes line endings for the content read from the hook template and its combined content before writing. This change ensures that the hook content script is always consistent, improving compatibility across different platforms.

• New Line Endings Normalization Helper Method
  A new function, NormalizeShellScriptLineEndings, has been added to replace Windows-style line endings with Unix-style ones. It simplifies line ending standardization throughout the codebase, enhancing cross-platform compatibility.

• Test Suite for Line Endings Normalization
  The new LineEndingTests test suite verifies the behavior of the NormalizeShellScriptLineEndings method. It provides assurance that the new function handles diverse line ending styles as expected, aiding in stable and reliable software operation.

[Copilot]

Pull request overview

This PR addresses cross-platform shell hook execution issues by ensuring Husky-generated hook scripts use LF line endings, preventing CRLF shebangs from breaking on Linux/WSL.

Changes:

• Added ShellScriptLineEndings.Normalize utility to convert CRLF/CR to LF.
• Applied normalization when generating .husky/_/husky.sh and hooks created via set, and added .husky/.gitattributes to enforce LF checkouts.
• Added regression tests covering CRLF and standalone CR normalization, plus install behavior for .gitattributes.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Husky/Utils/ShellScriptLineEndings.cs	Introduces LF normalization helper for shell script content.
src/Husky/Cli/SetCommand.cs	Normalizes generated hook file content before writing.
src/Husky/Cli/InstallCommand.cs	Normalizes husky.sh template and creates .husky/.gitattributes to enforce LF.
tests/HuskyTest/Utils/LineEndingTests.cs	Adds unit tests for CRLF and CR-to-LF normalization.
tests/HuskyTest/Cli/InstallCommandTests.cs	Adds coverage for .gitattributes creation/non-overwrite during install.

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[Copilot]

set now normalizes the initially generated hook content, but add can still append Command containing \r/CRLF (see AddCommand.AppendAllTextAsync(...)), reintroducing CR characters into an existing hook script and breaking execution on Linux. Normalize the appended content (or read/normalize/rewrite the whole file) in the add flow as well so hooks remain LF-only after subsequent add operations.

[Copilot]

Line-ending normalization + .gitattributes creation is duplicated between CreateResources and CreateResourcesAsync, and CreateResources appears unused in this file (only CreateResourcesAsync is called). This increases the risk of these two paths diverging over time; consider removing the dead sync method or extracting shared logic into a single helper used by the actual execution path.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

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