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R16.1-R16.4: observer scope (5 mandatory fields incl. primary_rationale), stack-conscious events (routing_decision + factor matrix 5 axes), non-override status, cross-refs. Layered on top of R15 off-phase routing. Per ADR-011 + spec v1.1 §5.2.1 amendment. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>