ci: move Windows and macOS out of the blocking path (#420)

The maintainer deferred Windows and macOS to the end of the redesign.
The merge queue now runs Linux on Python 3.12-3.14, real ComfyUI, the
frontend coverage shards and the Firefox/WebKit page workflows; pull
requests keep the Linux 3.12 subset. The six Windows/macOS legs move to
the new portability.yml, which runs on push to main, nightly and on
demand, keeps the 27-minute limit and is never a required check. Red
runs there are fixed at their cause before the cutover (#334).

.github/workflows/portability.yml

@@ -0,0 +1,55 @@
+name: Windows and macOS
+
+permissions:
+  contents: read
+
+# Non-blocking portability runs (#420): never on pull requests or in the merge queue, and no context
+# here is a required check. A red run is fixed at its cause before the workspace cutover (#334).
+on:
+  push:
+    branches: [main]
+  schedule:
+    - cron: "17 3 * * *"
+  workflow_dispatch:
+
+# Every run gets its own group (run_id), so no main commit's run is ever cancelled or dropped as pending.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.run_id }}
+  cancel-in-progress: false
+
+env:
+  PYTHONFAULTHANDLER: "1"
+
+# Time limit rule as in test.yml: ceil(1.5 x the slowest of three recent green runs on main) + 3
+# minutes, never under 5. Measured 2026-10-26 in test.yml on runs 40257217681 (3be0ada),
+# 40240706568 (fb9134f), 40228167328 (f9835aa), before these legs moved here in #420:
+#   slowest py3.10 on windows-latest: 12m43s / 15m54s / 14m53s -> 27 min
+#     (macos 6m14s-8m30s, windows 11m42s-15m54s)
+jobs:
+  test:
+    name: py${{ matrix.python-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 27
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, macos-latest]
+        python-version: ["3.12", "3.13", "3.14"]
+
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v7
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: requirements-dev.txt
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+
+      - name: Run tests
+        run: python -m tests.run_suite -v

.github/workflows/test.yml

@@ -28,6 +28,8 @@ env:
 #   py matrix, slowest py3.10 on windows-latest: 12m43s / 15m54s / 14m53s -> 27 min
 #     (ubuntu 5m27s-6m27s, macos 6m14s-8m30s, windows 11m42s-15m54s)
 #     3.10 and 3.11 left the matrix and 3.14 joined it in #356; re-measure after three green main runs.
+#     Windows and macOS moved to portability.yml (#420), which keeps this 27-minute limit; this
+#     Linux-only matrix keeps it too until it is re-measured.
 #   real ComfyUI compatibility: 13m32s / 8m55s / 11m46s -> 24 min
 #   coverage gate (85%): 7m26s / 7m22s / 7m54s -> 15 min
 #   perf budget 30s / 29s / 27s, black and flake8 39s / 37s / 39s,
@@ -35,8 +37,9 @@ env:
 #   all tests: a result check without setup, 5 min (the floor)
 #
 # Pull requests run a fast subset (#420): Python 3.12 on ubuntu-latest, coverage, lint and frontend
-# modules. The merge queue (merge_group), pushes to main and manual runs take the full matrix and the
-# real ComfyUI job. "all tests" is the required gate that holds the queue to that full set.
+# modules. The merge queue (merge_group), pushes to main and manual runs add Python 3.13 and 3.14 on
+# Linux and the real ComfyUI job. "all tests" is the required gate that holds the queue to that set.
+# Windows and macOS run in portability.yml (push to main, nightly, on demand) and never gate a merge.
 jobs:
   test:
     name: py${{ matrix.python-version }} on ${{ matrix.os }}
@@ -45,7 +48,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ${{ github.event_name == 'pull_request' && fromJSON('["ubuntu-latest"]') || fromJSON('["ubuntu-latest", "windows-latest", "macos-latest"]') }}
+        os: [ubuntu-latest]
         python-version: ${{ github.event_name == 'pull_request' && fromJSON('["3.12"]') || fromJSON('["3.12", "3.13", "3.14"]') }}
 
     steps: