Grinder and Saw hopper blocks replace the Refiner and Stone cutter in the menu (t4)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tasks/t4_hopper_blocks_instead.md

@@ -1,13 +1,19 @@
 ---
 id: t4
 title: Hopper blocks instead of fixed-size hoppers
-status: Todo
+status: Review
 created: 2026-10-24
-updated: 2026-10-24T04:52:40Z
+updated: 2026-10-24T20:06:51Z
 tags: [discussion]
-order: 7
+order: 1
 report: |
-  (agent) Decided 2026-10-24 (docs/DESIGN.md); not built yet.
+  (agent) Built. Grinder ($60) and Saw ($90) are 1-block pieces in the Machines tab. Grains
+  resting on top are worked and the result drops out underneath, so a row of them between two
+  walls is a hopper of any width, and each block adds speed (two Grinders = one old Refiner, one
+  Saw = one old Stone cutter). A Saw stacked on a Grinder cuts the stone and grinds everything
+  else. If the space underneath fills up the block stops; hover it to see why. The Refiner and
+  Stone cutter are gone from the menu; ones already built keep working. Please try a wide grinder
+  hopper fed with the nozzle, a Saw on a Grinder, and an old save that has a Refiner.
 ---
 
 ## Context
@@ -16,5 +22,5 @@ report: |
 
 ## Subtasks
 
-- [ ] Grinder block (does what the Refiner does) and Saw block (Stone cutter), 1 block each; side by side they make a wider, faster hopper
-- [ ] Refiner and Stone cutter leave the build menu; built ones in old saves keep working
+- [x] Grinder block (does what the Refiner does) and Saw block (Stone cutter), 1 block each; side by side they make a wider, faster hopper
+- [x] Refiner and Stone cutter leave the build menu; built ones in old saves keep working