feat(llm-security-copilot): port llm-security v5.1.0 to GitHub Copilot CLI

Full port of llm-security plugin for internal use on Windows with GitHub
Copilot CLI. Protocol translation layer (copilot-hook-runner.mjs)
normalizes Copilot camelCase I/O to Claude Code snake_case format — all
original hook scripts run unmodified.

- 8 hooks with protocol translation (stdin/stdout/exit code)
- 18 SKILL.md skills (Agent Skills Open Standard)
- 6 .agent.md agent definitions
- 20 scanners + 14 scanner lib modules (unchanged)
- 14 knowledge files (unchanged)
- 39 test files including copilot-port-verify.mjs (17 tests)
- Windows-ready: node:path, os.tmpdir(), process.execPath, no bash

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -10,6 +10,7 @@ plugins/
   config-audit/          v3.0.1  — Configuration intelligence (health, opportunities, auto-fix)
   linkedin-thought-leadership/  v1.1.0  — LinkedIn content pipeline + analytics
   llm-security/          v5.1.0  — Security scanning, auditing, threat modeling
+  llm-security-copilot/  v5.1.0  — Copilot CLI port of llm-security (Windows-ready)
   ms-ai-architect/       v1.8.0  — Microsoft AI architecture (Cosmo Skyberg persona)
   okr/                   v1.0.0  — OKR guidance for Norwegian public sector
   ultraplan-local/       v1.6.0  — Deep planning, research, execution