APR-Lite Phase 32: Serialized Chain Architecture & Agentic Guard Framework

This document is the canonical technical record for APR-Lite Phase 32, which delivers two foundational architectural additions to the substrate governance platform. The first is an object that serializes all governance chain write operations per tenant, eliminating the hash chain race condition that arose from concurrent event emission during onboarding. The second is APR-Guard: a four-phase agentic invariant enforcement framework spanning web fetch validation, execution control, structural payload analysis, and officer identity verification. Phase 32 also delivers the canonical Action Envelope v1, the CCDC-to-UI payload contract, the Production Officer Action UI, and Family Stewardship Mode. All components maintain the additive-only constraint: no prior phase capability is altered, deprecated, or removed.