fix: Replace EOL macOS M1 resource class with M4 Pro (#373)

* fix: Replace EOL macOS M1 resource class with M4 Pro in CircleCI config

The macos.m1.large.gen1 resource class reached end-of-life on Feb 16,
2026 and was removed by CircleCI. All CI builds using this class fail
instantly. Replace with macos.m4pro.medium, CircleCI's recommended
successor for Apple silicon macOS builds.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: Use correct M4 Pro resource class name without macos. prefix

The new M4 Pro resource classes dropped the `macos.` prefix used by
the old M1/M2 classes. The correct name is `m4pro.medium`, not
`macos.m4pro.medium`.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: salmageek

.circleci/config.yml

@@ -4,7 +4,7 @@ version: 2.1
 macos_config: &macos_config
   macos:
     xcode: 16.0.0
-  resource_class: macos.m1.large.gen1
+  resource_class: m4pro.medium
   shell: /bin/bash --login -eo pipefail
 
 setup_env_file: &setup_env_file