nx_analyst_store_scale_gate.nx

nx_analyst_store_scale_gate.nx -- F1001: prove the analyst survives a dataset LARGER than one seg_store version window, and that when it cannot, it SAYS SO instead of quietly analysing a recency slice. THE DEFECT THIS PINS (found 2026-07-23 reading nx_seg_store for F1001): ss_scan keeps at most SS_VER_WINDOW=256 versions of one key and the window SLIDES -- oldest out, newest kept. So 300 rows stored under one key read back as the NEWEST 256, and nx_analyst_store returned them with no signal at all. Every number in the resulting report described a slice nobody asked for. T1/T2 reproduce that on real committed data; T3-T5 prove the sharded path reads all 300; T6-T8 pin the fail-closed edges. D001-compliant: verdict via the shared nx_gate_verdict lib. license_tier: ORIGINAL expect_exit: 0