Add GrokHunter (core, coding-team, full)

[FineComputer14451]

Summary

Adds three remote-source plugins from FineComputer14451/GrokHunter, pinned to 646f043a3d268e4a47888301ad23658c114305c0:

name	path	purpose
grokhunter	plugins/grokhunter	Core install/doctor + pair-programming
grokhunter-coding-team	plugins/grokhunter-coding-team	Design→Build→Harden team
grokhunter-full	plugins/grokhunter-full	Complete coding-lab pack

Notes for reviewers

• Ownership: published under FineComputer14451 (repo owner).
• Scope: Termux × Kali NetHunter rootless coding lab for Grok Build. Omits offensive recon (nethunter-recon).
• Affiliation: not affiliated with xAI, Offensive Security, Termux, or jorexdeveloper (stated in descriptions / CREDITS).
• Keywords: brand-scoped (grokhunter, grokhunter install, …) — not generic cli/api.
• No hooks / MCP / RCE postinstall in these packs (skills/agents/commands/rules only).
• Additional per-lab packs remain in the project’s own marketplace via grok plugin marketplace add FineComputer14451/GrokHunter (not all listed here to keep the official catalog focused).

Checklist

• Entries in .grok-plugin/marketplace.json (kebab-case, unique)
• Remote sources pin full 40-char lowercase SHA
• .grok-plugin/plugin-index.json regenerated
• python3 scripts/validate-catalog.py OK
• python3 scripts/generate-plugin-index.py --check OK
• homepage + description present; license MIT upstream

Test plan

• CI validate + index check green
• Optional: grok plugin install grokhunter --trust after merge