fix(audit): Agent Zero NATS flag + audit gate CI

[POWERFULMOVES]

Summary

• Enables NATS JetStream flag in Agent Zero submodule config
• Adds SUBMODULE_AUDIT_REFERENCE.md documenting audit gate CI patterns

Retargeted from PR #635 (was incorrectly based on main).

Test plan

• Verify Agent Zero submodule pointer at 6296dd6
• Confirm audit gate CI reference doc is accurate

🤖 Generated with Claude Code

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch hardened/audit-agent-zero-bootstrap

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