Introduces ENCODER_INPUT_DIM = 56 (FEATURE_DIM + 16). All encoder
first-layer weight matrices (VSN gate, Mamba2 L1 input projection)
now sized for 56 input dims. The extra 16 are per-batch state:
4 trade_context + 12 multires features.
- snap_feature_assemble_batched: output stride → ENCODER_INPUT_DIM,
zero-fills dims [40..56] for the broadcast kernel to overwrite.
- New rl_encoder_context_broadcast.cu: writes trade_context_d[B×4]
+ multires_output_d[B×12] into each of the K sequence rows per
batch at positions [40..56].
- CfcConfig.n_in, Mamba2 L1 in_dim, VSN gate, window_tensor_d,
all forward/backward scratch buffers updated to ENCODER_INPUT_DIM.
- CfcTrunk default config updated.
The broadcast kernel launch integration into the forward_only path
is the final wire-up step — until then dims 40-55 are zero-filled
(safe: Xavier init on new columns means encoder starts by learning
to ignore them, then gradually incorporates the signal).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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