Add per-piece export files and render script for cpu_case

- Add plunger.scad: single plunger in print orientation (flange on build plate)
- Add render.sh: renders bottom, lid, and plunger to STL via openscad
- Fix bottom.scad and lid.scad: suppress SHOW_PLUNGERS so export files produce clean geometry
- Update bottom.stl and lid.stl: regenerated without plungers

bottom.scad

@@ -1,8 +1,9 @@
 include <cpu_case.scad>
 
-SHOW_BASE  = false;
-SHOW_BOARD = false;
-SHOW_LID   = false;
+SHOW_BASE     = false;
+SHOW_BOARD    = false;
+SHOW_LID      = false;
+SHOW_PLUNGERS = false;
 
 // Base is already floor-down, cavity-up — correct print orientation at origin
 base();

lid.scad

@@ -1,8 +1,9 @@
 include <cpu_case.scad>
 
-SHOW_BASE  = false;
-SHOW_BOARD = false;
-SHOW_LID   = false;
+SHOW_BASE     = false;
+SHOW_BOARD    = false;
+SHOW_LID      = false;
+SHOW_PLUNGERS = false;
 
 // Ceiling on build plate, flanges pointing up — matches the "print upside-down" note in cpu_case.scad
 translate([0, LID_Y_LEN, LID_H])

plunger.scad

@@ -0,0 +1,12 @@
+include <cpu_case.scad>
+
+SHOW_BASE     = false;
+SHOW_BOARD    = false;
+SHOW_LID      = false;
+SHOW_PLUNGERS = false;
+
+// Single plunger, long axis vertical — flange on build plate.
+// rotate([90,0,0]) maps Y→Z; translate lifts flange face to z=0.
+translate([0, 0, FLANGE_T])
+  rotate([90, 0, 0])
+    plunger();

plunger.stl

@@ -0,0 +1,2284 @@
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render.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+OPENSCAD=/opt/homebrew/bin/openscad
+cd "$(dirname "$0")"
+
+render() {
+  local src=$1 out=$2
+  echo "  $src → $out"
+  "$OPENSCAD" -o "$out" "$src" 2>&1 | grep -v '^$'
+}
+
+echo "Rendering cpu_case pieces..."
+render bottom.scad  bottom.stl
+render lid.scad     lid.stl
+render plunger.scad plunger.stl
+echo "Done."