Context: ABG-V2-REVIEW

Context revision: 1
Read AGENTS.md, .agent-taskgraph/spec.md revision design-spec-r3, docs/reviews/PRE_DEVELOPMENT_READINESS_AUDIT.md, docs/reviews/DESIGN_VALIDATION_CONTRACT.md and this Goal.
Review only fixed Git revision 7ffd6b0; later main changes are out of scope.
Reference archive is structural evidence only; do not extract or copy assets.
Existing reviewer observation is context, not verdict evidence.