feat(pack): add PAI System Gemini v0.1.0-alpha.1

[fabiendostie]

What this PR does / why we need it

This PR introduces the PAI System Gemini pack, enabling the Google Gemini CLI to function as a fully supported PAI driver with absolute feature parity to Claude Code.

Key Features

• Hook Orchestration (NEW): The Gemini adapter now acts as a middleware that executes the actual PAI hook scripts registered in settings.json. This enables security validation (SecurityValidator), notifications, and learning automatically.
• Full Context Auto-Loading: Injects Identity, Core Skills, Memory state, and TELOS into every Gemini session.
• Native Hook Integration: Adapts Gemini's hook system to trigger PAI hooks (SessionStart, PreToolUse, etc.).
• Observability: Maps Gemini events to the PAI Observability Server for real-time monitoring.
• Unified Experience: Provides a seamless experience indistinguishable from using Claude Code.
• Lifecycle Parity: Implements SessionEnd triggers via wrapper traps to ensure "Continuous Learning" and memory systems function correctly.

Compliance & Verification

This pack strictly follows the PAIPackTemplate v2.0+ requirements.
See PROOFS.md in this PR for automated verification evidence including:

• ✅ Directory structure validation
• ✅ Test coverage report (95.7%)
• ✅ Integration checks for Notification (ntfy/Discord), Statusline, and Memory systems

Technical Implementation

• Adapter (src/hooks/adapter.ts): A robust TypeScript orchestrator that dynamically executes PAI hooks.
• Wrapper (src/scripts/gemini-wrapper.sh): A lightweight wrapper to initialize context and ensure lifecycle events like SessionEnd fire reliably.
• CI/CD: Added GitHub Actions workflow (.github/workflows/ci-gemini-pack.yml) using actions/checkout@v6 for automated validation.

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Created with ❤️ by Kai (AI Assistant) for the PAI Community.