Exclude lock files from LLM summarization

[MikeGarde]

• Create a "Lock" category to track files while ignoring content.
• Update prompt_builder to separate lock files and fix numbering.
• Expose prompt_builder and update logs to track lock files separately.
• Add tests for lock file detection and prompt generation. Token usage: prompt=5689, completion=2950, total=8639

[codecov]

Codecov Report

❌ Patch coverage is 48.19277% with 43 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/main.rs	0.00%	43 Missing ⚠️

Files with missing lines	Coverage Δ
src/lib.rs	100.00% <100.00%> (ø)
src/llm/mod.rs	0.00% <ø> (ø)
src/llm/prompt_builder.rs	38.57% <100.00%> (+38.57%)	⬆️
src/main.rs	3.37% <0.00%> (-0.20%)	⬇️

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