ci: switch macOS jobs back to self-hosted Mac Studio runner

GitHub-hosted macos-latest confirmed working but self-hosted
[macOS, ARM64] is faster with warm caches. Keep windows-latest
for deterministic Windows builds.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: pythoninthegrass

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
     if: >
       github.event_name == 'release' ||
       inputs.platform == 'all' || inputs.platform == 'macos' || inputs.platform == ''
-    runs-on: macos-latest
+    runs-on: [macOS, ARM64]
     timeout-minutes: 30
 
     steps:

.github/workflows/test.yml

@@ -37,8 +37,8 @@ env:
 jobs:
   rust:
     name: Rust Lint, Format, and Test
-    runs-on: macos-latest
-    timeout-minutes: 30
+    runs-on: [macOS, ARM64]
+    timeout-minutes: 20
     env:
       CARGO_INCREMENTAL: 1
       CARGO_TERM_COLOR: always
@@ -103,7 +103,7 @@ jobs:
       matrix:
         include:
           - platform: macos
-            os: macos-latest
+            os: [macOS, ARM64]
             target: aarch64-apple-darwin
           - platform: linux
             os: ${{ inputs.linux-runner || 'blacksmith-4vcpu-ubuntu-2404' }}
@@ -201,7 +201,7 @@ jobs:
 
   playwright-tests:
     name: Playwright E2E Tests
-    runs-on: macos-latest
+    runs-on: [macOS, ARM64]
     timeout-minutes: 20
 
     steps: