Add harness-ai-kit to Cross-Agent Tools

[Kingong]

Package manager for AI agent assets (skills/CLIs/MCPs/loops) across Codex, Claude Code, Cursor, and Kiro.

• Repo: https://github.com/seed-forge/harness-ai-kit
• PyPI: https://pypi.org/project/harness-ai-kit/ (v0.1.0)
• What it does: \pip install harness-ai-kit\ → \�i-kit add skill \ → \�i-kit sync\ — installs AI agent skills with dependency resolution, lockfile (SHA-256), and multi-runtime support (Codex/Claude Code/Cursor/Kiro).
• Why Cross-Agent Tools: ai-kit is runtime-agnostic — one CLI manages skills across all major AI coding agents.
• Includes: 23 curated enterprise skills (MySQL deadlock diagnosis, K8s CrashLoopBackOff, container OOM, etc.)
• License: Apache-2.0