Test plan

[gitar-bot-staging]

Expand .gitignore to exclude common development artifacts

Description

This PR significantly expands the .gitignore file to prevent accidental commits of common development artifacts, temporary files, and system-generated files across multiple programming languages and platforms.

Motivation

• Improve repository hygiene by preventing unwanted files from being tracked
• Standardize ignore patterns to cover common development scenarios
• Reduce the risk of accidentally committing sensitive or unnecessary files like build artifacts, temporary files, and system-generated content

Impact

• Low risk: Only affects git tracking behavior, no functional code changes
• Positive impact: Cleaner repository with reduced noise from unwanted files
• Cross-platform: Added patterns support multiple operating systems and development environments

Changes Made

Added comprehensive ignore patterns for:

📁 Click to view all added file patterns

• Script files: *.sh
• Compiled files: *.class, *.jar, *.pyc, *.pyo
• System files: *.DS_Store, *.Thumbs.db
• Temporary files: *.tmp, *.temp, *.bak, *.cache, *.old, *.part, *.partial
• Log files: *.log, *.dump, *.dmp, *.stackdump
• Editor files: *.swo, *.swp, *.eslintcache
• Archive files: *.zip, *.tar, *.gz, *.bz2, *.rar, *.7z
• Disk images: *.iso, *.dmg
• Package files: *.pkg, *.deb, *.rpm, *.msi
• Binary files: *.exe, *.dll, *.so, *.dylib, *.lib, *.a, *.o, *.obj, *.res, *.pdb

Test Plan

• ✅ Verify that existing tracked files remain unaffected
• ✅ Test that new file types matching the patterns are properly ignored by git
• ✅ Confirm the repository working tree remains clean

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