Helper Utility Functions

Several new utility functions were added to improve code organization:

• yn1() at line 416368: Enhanced slice function with offset support (replaces Fn1())
• kn1() at line 416372: Relative path calculator that returns absolute path if result would escape working directory
• _n1() at line 416377: Formats limit/offset parameters for display
• Sb5() at line 430186: Reads CLAUDE_CODE_MAX_TOOL_USE_CONCURRENCY environment variable with default value of 10
• YuA() at line 207879: Strips <sandbox_violations> tags from content using regex
• dS2() at line 470949: Comparison function for checking if one value exceeds another in a specific context