Two minor code-review nits accumulated across A1-A4 reviews; closing
them in a single docs/comment-only commit before Layer A continues.
1. tests/sp5_producer_unit_tests.rs module docstring (A4 review):
the file header still claimed it covered only A1's two kernels
even though A2/A3/A4 had each appended their tests. Updated header
to enumerate all 9 tests across A1-A4 (+ 1 grad_cosine_sim test
landed in 4da6b34d7) so a reader cold to the file can locate each
producer's coverage without scanning the body.
2. gpu_dqn_trainer.rs:2854 stale field comment `[B, TOTAL_ACTIONS(11)]`
(A1 review): comment was left at 11 since the pre-4-direction
layout but the actual slot count is 13 (4 dir + 3 mag + 3 ord + 3
urg). Updated to `[B, TOTAL_ACTIONS(13)]` with the per-branch
breakdown inline so the field declaration matches the SP5 producer
docstrings (e.g. q_branch_stats_kernel comments at line 277, 282).
Comment-only changes; no behavior change. cargo check + cargo test
--no-run both clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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