refactor(agent): factor CLAUDE.md to thin proxy with prompts submodule (RFC-001)

[CodeMonkeyCybersecurity]

Context

Part of the CLAUDE.md cross-repo DRY refactor (RFC-001) tracked in cybermonkey/prompts#564.

Artemis currently has a 919-line monolithic CLAUDE.md with governance contracts (testing, security, workflow, git rules, coordination) copy-pasted inline. This violates RFC-001's progressive disclosure architecture and makes governance updates a manual multi-repo operation.

Goal

Replace with a thin proxy (~60 lines) that:

1. Imports GOVERNANCE-SUMMARY.md as the always-loaded compact ruleset (~65 rules)
2. References full contracts via @third_party/prompts/CONTRACT.md imports
3. Retains only artemis-specific context (bug bounty automation, Go toolchain, worker architecture, commands)

Work

1. Add third_party/prompts git submodule:

   git submodule add ssh://git@vhost7:9001/cybermonkey/prompts.git third_party/prompts

2. Write thin CLAUDE.md (~60 lines) containing:

   • Project purpose (bug bounty automation, distributed scanning, Go)
   • Commands (build, test, lint — from Makefile)
   • Governing contracts table with @third_party/prompts/ imports
   • Artemis-specific approach (human-centric, evidence-based, worker architecture)
   • Cross-repo work section
   • Testing: @third_party/prompts/TESTING.md + @third_party/prompts/TESTING-GO.md

3. Once cybermonkey/prompts#562 merges, add:

   Generic anti-patterns (cross-repo): @third_party/prompts/ANTI-PATTERNS.md
   

Pattern

Same pattern applied to hecate, hera, helen. See:

• hecate: refactor/2374-claude-md-factoring
• hera: refactor/7-claude-md-factoring
• helen: refactor/14-claude-md-factoring

Branch

refactor/<this-issue-number>-claude-md-factoring

References

• RFC-001: third_party/prompts/docs/rfcs/RFC-001-governance-prompt-architecture.md (once submodule is added)
• Tracking issue: cybermonkey/prompts#564
• ANTI-PATTERNS.md blocker: cybermonkey/prompts#562