What would you like to be added?

Merge duplicate file exclusion logic between read-many-files.ts and glob.ts into a shared utility

What to add:

• Shared FileExclusions utility class
• Both tools use same exclusion patterns
• Extensible structure for future CLI configuration

Why is this needed?

Current problems:

• Code duplication: Two tools maintain separate exclusion lists (35+ patterns vs 2 patterns)
• Inconsistent behavior: glob.ts only excludes node_modules and .git, while read-many-files.ts excludes build dirs, binaries, coverage files, etc.
• Maintenance burden: Pattern updates require changes in multiple files
• Poor UX: Users get different results from different tools for the same operation

Business impact:

• Developers waste time on inconsistent tool behavior
• Risk of exposing sensitive files through incomplete exclusions
• Technical debt increases maintenance costs

Already identified: TODO comment at line 104 shows this consolidation was planned but never implemented.

Additional context

No response