v2 source, NB2 prompt contract, and the slice editor

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+# Scene prompt — Course I: Docker image layers (S0 SPIKE)
+
+**v2 (2026-07-27)** — tuned from the first two candidates: keep shot 2's generous gaps,
+kill the fake-code glyphs on the magenta layer (shot 1's abstract treatment wins).
+Generate ~4 at 16:9, curate with the reject checklist, save to disk for pickup.
+
+---
+
+Dark technical exploded-view illustration in a cinematic sci-fi engineering style.
+Solid near-black deep void background, hex #070b14 — completely clean: no stars, no grid,
+no texture, no particles behind or around the objects. Matte dark metal-and-glass surfaces
+with glowing neon edge lighting: primary cyan #3fbaf5, secondary magenta #e879f9 accents,
+cool white rim highlights. Camera: fixed 30-degree isometric angle, subject perfectly
+centered with generous empty margins on all sides. Even studio lighting, no vignette,
+no lens flare, no depth-of-field blur. ABSOLUTELY NO text, no letters, no numbers, no
+words, no code, no glyphs, no labels, no arrows, no callout lines, no UI elements
+anywhere in the image — every surface marking must be an abstract geometric pattern
+only. Every component is fully separated from its neighbours by generous gaps of pure
+void — nothing touching, nothing overlapping, and no beams, cables, or connectors
+spanning between the separated parts.
+
+The subject: an exploded vertical stack of four flat square slabs floating in the void,
+widely spaced along a vertical axis with large empty gaps of void between each one — the
+layers of a container image, seen mid-explosion. Push the slabs far apart so each floats
+clearly on its own with dark void visible between them.
+
+Bottom slab: the thickest and heaviest, a solid foundational block of dark brushed metal
+with a bright cyan glowing seam running around its edge.
+Second slab up: thinner, dark, its top face covered in an intricate circuit-board trace
+pattern glowing soft cyan — fine geometric pathways and nodes.
+Third slab: thin and precise, dark, its top face decorated with sparse abstract glowing
+magenta line-work — elegant angular geometric strokes and flowing traces, purely
+decorative shapes with no resemblance to writing, text, or code.
+Top slab: the thinnest, semi-transparent frosted glass with a soft white-magenta ghost
+glow — barely-there and ephemeral.
+
+All four slabs share the same square footprint and sit in perfect vertical alignment,
+reading as one machine pulled apart for inspection.
+
+---
+
+## Build-side notes (not part of the prompt)
+- **Slice plan:** 4 polygons (one per slab). Scrub: collapsed stack → outward to the
+  hero's exploded spacing. DOM legend: base OS → dependencies → app code → writable layer.
+- **Motion constraint (locked 2026-07-27):** slabs occlude each other in 2D, so each lower
+  slice has a hidden "bite". Animating collapsed→hero only ever INCREASES occlusion, so
+  bites stay hidden. Never over-explode past the source layout and never fan sideways —
+  that exposes the tears.
+- **Watermark:** Gemini sparkle bottom-right — strip with
+  `bztmon-site/scripts/dewatermark.mjs` before slicing.