docs: add script security assessment

[benhunter]

Summary

• document a security assessment of all 48 script-like files
• classify findings by severity with concrete file and line references
• record static validation results and per-script risk dispositions
• provide a prioritized remediation order

Validation

• Python AST parsing passed for all Python files
• JavaScript syntax checking passed
• PowerShell parsing identified an existing syntax error in Monitor-ADGroupChanges.ps1
• secret-pattern scan found no committed private keys or recognizable access tokens
• ShellCheck was unavailable and WSL has no installed distribution

This PR adds documentation only and does not change script behavior.