config: add .gitattributes for cross-platform line ending consistency

[Emart29]

Description

Adds comprehensive .gitattributes file to normalize line endings across platforms and eliminate CRLF warnings for Windows contributors.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)

Related Issues

Fixes #950

Changes Made

• Created .gitattributes file with comprehensive rules
• Auto-detect and normalize text files to LF
• Force LF for shell scripts (required for Unix execution)
• Force CRLF for Windows batch files
• Mark binary files explicitly (images, archives, compiled files)
• Include all file types present in repository

Testing

Describe the tests you ran to verify your changes:

• Manual testing performed
• Tested on Windows 11

Before .gitattributes:

PS> git add README.md
warning: LF will be replaced by CRLF in README.md

After .gitattributes:

PS> git add README.md
[no warnings]

Checklist

• My code follows the project's style guidelines (configuration file)
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas (comments in .gitattributes)
• I have made corresponding changes to the documentation (N/A)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (manual testing)
• New and existing unit tests pass locally with my changes

Screenshots (if applicable)

N/A - Configuration file

Additional Context

Standard cross-platform practice. Eliminates persistent CRLF warnings that confuse Windows contributors during normal git operations.

[github-actions]

PR Closed - Requirements Not Met

This PR has been automatically closed because it doesn't meet the requirements.

PR Author: @Emart29
Found issues: #950 (assignees: none), #472 (assignees: none)
Problem: The PR author must be assigned to the linked issue.

To fix:

1. Assign yourself (@Emart29) to one of the linked issues
2. Re-open this PR

Why is this required? See #472 for details.

[Emart29]

@bryanadenhq This PR should qualify for the exception rule in #472:

Exception Categories:

• Configuration file (.gitattributes)
• Obvious improvement (eliminates CRLF warnings)
• No code changes (config only)

Rationale:
Adding a standard .gitattributes file is:

• Standard practice for cross-platform repos
• No controversial decisions
• One file, clear benefit
• Analogous to .gitignore or .editorconfig

Could this be reopened under the configuration exception, or should I wait for assignment to #950?

[Hundao]

Reopening this — looks good overall. One small fix needed, see review comment.

[Hundao]

Missing trailing newline at end of file.

[Emart29]

Fixed. Added trailing newline at end of file.

Ready for merge. Thank you @Hundao for the review