snapshot_realized_pnl / snapshot_position_lots / snapshot_open_horizon_mask
were the host-side read paths for the close-detection loop that P3
(3836e2578) replaced with snapshot_pos_state + detect_close_transitions_
batched kernels. The helpers stayed dead-code-warned after P3; per
feedback_no_legacy_aliases + feedback_no_hiding, delete them.
submit_market_fn is NOT dead — pub fn submit_market wraps it and has 4
test callers (lob_sim_fixtures, lob_sim_fuzz, ring3_replay × 2). Kept.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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