Govern task context and advance execution pointer

docs/status/M16-GAP-00003.md

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+# M16-GAP-00003 Status
+
+status: done
+task: Brush data-block LOCAL_EXACT slice
+updated: 2026-08-19 America/New_York
+enablingTask: true
+parityStateChange: true
+
+Added bounded `BrushIR` fields to the native Main reader and optional SceneIR parser field. A real
+Blender 5.2 Brush fixture reports `WebGapBrush` size 42, alpha 0.65, hardness 0.8, spacing 17 and
+jitter 0.2. Full-Main WASM and desktop match exactly, including save/reopen.
+
+Evidence: `npm --prefix web run test:generated-gap -- --task M16-GAP-00003` passed with
+`brush=brush:WebGapBrush size=42 desktop=exact saveReopen=exact`.
+
+Next task: `M16-GAP-00004` (Camera data-block).