Govern task context and advance execution pointer

docs/tasks/M16-GAP-00003.md

@@ -0,0 +1,11 @@
+# M16-GAP-00003：Brush data-block LOCAL_EXACT slice
+
+- `task`: `M16-GAP-00003`
+- `parent`: `M16-GAP-00002`
+- `status`: `in_progress`
+- `gap`: `datablock:Brush`
+- `ownerFamily`: `RNA_DATABLOCK`
+- `targetImplementationClass`: `LOCAL_EXACT`
+
+Required fixture, Blender desktop report, WASM report, save/reopen comparison and manifest hashes must
+be produced before completion. The generated-gap checker currently reports `IMPLEMENTATION_NOT_STARTED`.