File Permission Check Consolidation

What: File write permission checks now use a centralized safety validation function for consistency.

Details:

• New SL1() function provides unified safety checks for write operations
• Checks for suspicious Windows paths, sensitive files, and permission rules
• Returns structured result with safety status and message
• Used by both direct file operations and tool permission handlers
• Evidence: New function SL1() at line 465870; used in jL1() at line 466119 and xn() at line 466119