chore: update configs submodule — docs/scripts review and cleanup
- README, CONTRIBUTING, QUALITY_GUIDELINES, AGENTS.md all aligned with production best practices (accurate counts, no max_pages, unified format) - validate-config.py: fix two bugs (unified config categories lookup, max_pages warning logic) - Delete old submit-config.md (duplicate of submit-config.yml with outdated content) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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