docs: add delvewheel to diagram, schema defaults, and docs (#2877)

Since delvewheel is now the default repair-wheel-command on Windows,
update all places where auditwheel/delocate were referenced but
delvewheel was missing:

- diagram.html: add delvewheel repair block for Windows (was grouped
  with ios/pyodide as optional dot)
- generate_schema.py: add Windows delvewheel default to the platform
  loop so schema.json includes the default
- schema.json: regenerated with Windows delvewheel default
- options.md: add Windows to defaults list, remove outdated tip about
  delvewheel being early-stage/optional, update examples
- contributing.md: add delvewheel to the tool list

Assisted-by: OpenCode:glm-5.1

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>

docs/diagram.html

@@ -190,8 +190,19 @@
           },
         },
         {
+          label: 'Repair using delvewheel',
           href: 'options/#repair-wheel-command',
-          platforms: ['windows', 'ios', 'pyodide'],
+          platforms: ['windows'],
+          style: 'block',
+          tooltip: {
+            title: 'CIBW_REPAIR_WHEEL_COMMAND',
+            tag: 'Customisable step',
+            description: 'Bundle shared libraries by running delvewheel on each built wheel.'
+          },
+        },
+        {
+          href: 'options/#repair-wheel-command',
+          platforms: ['ios', 'pyodide'],
           style: 'dot',
           tooltip: {
             title: 'CIBW_REPAIR_WHEEL_COMMAND',