refactor(AGENTS.md): restructure under Harness Engineering framework
- Integrate 24-article methodology into top-level framework - Add four core components (constraints/feedback/control/durable) - Add standard workflow (Plan-Generate-Validate-Review) - Add quality gates L1-L4 - Add layered trust model - Keep all project-specific content (build, style, config) - Reduce lines from 853 to 400 with better structure
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