Code review response for new export functionality

[Copilot]

Provided code review feedback for the newly added search analysis export feature, color utilities, debug macros, and heuristic cache improvements.

Review Findings

Critical Issues:

• SearchAnalysis: Null pointer dereference risk in all methods accessing current without checking if EnterGraph() was called first
• SearchAnalysis::ExportData(): Missing file error handling and explicit stream closure

Code Quality:

• debug_util.h: Nested conditional macros (_DEBUG/NDEBUG) create confusing logic paths
• color_util.cpp: Redundant color data stored in both colorToRGB and colorToInt maps
• SearchAnalysis.h:21: Missing space in function parameter list

Recommendations:

• Add null guards: if (!current) return; or ensure initialization in constructor
• Validate file operations: if (!out.is_open()) { /* handle error */ }
• Simplify debug macros to single conditional check
• Consolidate color maps to single source of truth

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