Advanced Loop Control Enables Phase 10 Language Maturity

The expansion of IR lowering to handle infinite loops, break, and continue statements fulfills a critical language design requirement and demonstrates significant engineering progress. Equally important, the introduction of AGENT_OPERATING_DOCTRINE.md marks a pivotal shift from informal development practices to standardized, documented workflows. However, the persistent 16-day merge backlog between submain and main signals potential integration challenges that could impact project velocity.