Adds per-epoch readout of the V/A breakdown so we can observe the
pre-SP17 baseline distribution before the identifiability projection
lands. Also instruments the kill criterion for Phase 0:
HEALTH_DIAG[N]: v_a_means [v=X a_dir=Y a_mag=... a_ord=... a_urg=...]
If train-multi-seed-b5gmp's Q(Flat) over-attribution is V-driven, V
should be elevated (~0.4+) while a_dir is small. If V is balanced and
A is doing the work, dueling cannot help and we abort SP17.
Block-tree-reduce kernel \`v_a_means_diag_kernel\` (no atomicAdd per
\`feedback_no_atomicadd\`); MappedF32Buffer per
\`feedback_no_htod_htoh_only_mapped_pinned\`.
Plan: docs/superpowers/plans/2026-05-08-sp17-dueling-q-network.md
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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