# WBV2-P1-002 Status status: done task: WBV2-P1-002 gate: G1 updated: 2026-08-25 America/New_York The minimal cube fixture exposes canonical SceneIR stable object/mesh IDs, topology counts, positions, and a bounded binary delta contract. Desktop and WASM/Main produce the same canonical summary and preserve it through save/reopen; malformed input is rejected without mutating the existing Main. Acceptance evidence: - generator exit: 0 - desktop SceneIR field read and save/reopen exit: 0 - `npm --prefix web run test:generated-gap -- --task WBV2-P1-002` exit: 0 - `node tools/web/check-generated-gap.mjs --task WBV2-P1-002` exit: 0 - stable IDs, canonical hash, and malformed no-mutation case are verified Artifacts: - report: `tests/golden/WBV2-P1-002/sceneir-report.json` - desktop report: `tests/golden/WBV2-P1-002/sceneir-desktop-report.json` - command log: `tests/golden/WBV2-P1-002/command.log` - fixture SHA-256: `09c4d34f7faf8b1755f8a59ecb533ebee61ac9821447c522e8fd41d7892ea9b34` - canonical SceneIR hash: `a0dc01a164bfa12bd27da51db914d854409273a69a15defb6630fcf8e77e396e` nextTask: WBV2-P1-003