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+## 2026-07-16 — E-SPRITE-IPB-HELIX-1 — moving object = HHTL-anchored splat sprite + helix motion code, mapped onto the x265 I/P/B grammar (crawl-first probe spec'd)
+
+**Status:** CONJECTURE [S/H] + PROBE SPEC (operator-directed amortization; the initial test deliberately replays the x265 GOP grammar, NOT H.268 — "not reaching for the stars").
+**What:** the next nested-inverse-pyramid 4×4 amortization: **I-frame** = the sprite's Gaussian-splat set at its HHTL anchor (HEEL|HIP|TWIG); **P-frame** = ONE helix direction code per sprite (`ResidueEdge` 24-bit hemisphere / `Signed360` 48-bit signed — object-level motion replacing x265's per-block MV field, its dominant encoder cost); **B-frame** = parametric interpolation along the helical path between anchors (bidirectional weights, no stored motion). Motion search → address arithmetic; the sprite footprint re-rasterizes through the Morton cascade at certificate-selected LOD; the same tile substrate serves codec rasterization and shader dispatch (E-H268-REPLAYABLE-TILE-1). Second amortization: the minimal wgpu replay harness this probe needs IS the harness PROBE-GPU-LUT is gated on — build once, both consume. Fisher-z canon applies to the read lanes (helix = the 2z rung).
+**Scope guards:** NOT x265 bitstream/byte parity (GOP *grammar* replay on our primitives; x265 itself at most an external bitrate/PSNR reference, never a gate); GPU render-grade only, bit-exactness on the CPU/wasm sprite-state path (C9 discipline). **KILL band:** if object-level helix motion collapses back into a dense per-splat MV field on the test paths, the sprite amortization dies as stated.
+**Cross-ref:** ndarray plan `x265-sprite-replay-probe-v1.md` (the spec + pass/KILL bands; §5 probe-queue row added), E-H268-REPLAYABLE-TILE-1, E-FISHERZ-CANONICAL-COSINE-REPLACEMENT-1, helix `ResidueEdge`/`Signed360`, ndarray `splat3d` (EWA + depth_cascade), PROBE-GPU-LUT (shared harness). Execution wave = a next plateau after TD-BGZ-TENSOR-PRE-LANE-REVIEW lands.
+
 ## 2026-07-16 — E-FISHERZ-CANONICAL-COSINE-REPLACEMENT-1 — THE canonical cosine/centroid replacement = the analytic Fisher-z codec (FamilyGamma, no materialization); helix : Fisher-2z :: cosine-replacement : Fisher-z
 
 **Status:** OPERATOR RULING (2026-07-16) + FINDING for the grounding identity. No layout changed; the L4 semantics are sharpened, not altered.