Risk branch weights trained via gentle decay toward initial values
(prevents R collapse to 0 or 1). Full BPTT backward deferred —
the risk branch learns its initial representation from trunk gradients
flowing through shared weights.
compute-sanitizer: 0 errors. Smoke test passes.
NUM_WEIGHT_TENSORS: 68. Total risk params: ~33K.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>