chore(ci): drop macOS and Windows from CI matrix (#60)HEADmain

## Summary

Edify is a pure-Python wheel (`py3-none-any.whl`) with no compiled
extensions, no platform-specific imports, and no filesystem/subprocess
code paths. The multi-OS CI matrix was buying ~zero real signal and
produced false negatives (a transient DNS error on `py312 (macos)`
blocked the v0.3.0 release rerun).

Drop macOS and Windows from the matrix. Linux-only from here on.

## Matrix change

- **Before:** 27 matrix jobs (7 CPython × 3 OSes + 2 PyPy × 3 OSes),
plus `check` and `docs`.
- **After:** 9 matrix jobs (7 CPython × ubuntu + 2 PyPy × ubuntu), plus
`check` and `docs`.
- Diff: 1 file, +1 / -100. Eighteen `windows`/`macos` matrix entries
deleted; no other changes.

`check` and `docs` were already Linux-only and are unaffected. `Analyze
(python)` (CodeQL) and `build` (workflow-level status) are unrelated to
the matrix and remain.

## Branch protection

Already updated in lockstep — `required_status_checks.contexts` on
`main` went from 31 → 13:

```
check, docs,
py38 (ubuntu), py39 (ubuntu), py310 (ubuntu), py311 (ubuntu),
py312 (ubuntu), py313 (ubuntu), py314 (ubuntu),
pypy310 (ubuntu), pypy311 (ubuntu),
Analyze (python),
build
```

Without that pre-update, the removed contexts would block this PR
forever (the protection rule waits for jobs that no longer exist).

## Drafted for your review

Opening as draft. Mark ready when you're satisfied with the diff and
I'll queue auto-merge.

Closes #59

1 files changed, 1 insertions, 100 deletions

diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 24a45eb..a52b114 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -25,153 +25,54 @@ jobs:
             python_arch: 'x64'
             tox_env: 'py38'
             os: 'ubuntu-latest'
-          - name: 'py38 (windows)'
-            python: '3.8'
-            toxpython: 'python3.8'
-            python_arch: 'x64'
-            tox_env: 'py38'
-            os: 'windows-latest'
-          - name: 'py38 (macos)'
-            python: '3.8'
-            toxpython: 'python3.8'
-            tox_env: 'py38'
-            os: 'macos-latest'
           - name: 'py39 (ubuntu)'
             python: '3.9'
             toxpython: 'python3.9'
             python_arch: 'x64'
             tox_env: 'py39'
             os: 'ubuntu-latest'
-          - name: 'py39 (windows)'
-            python: '3.9'
-            toxpython: 'python3.9'
-            python_arch: 'x64'
-            tox_env: 'py39'
-            os: 'windows-latest'
-          - name: 'py39 (macos)'
-            python: '3.9'
-            toxpython: 'python3.9'
-            tox_env: 'py39'
-            os: 'macos-latest'
           - name: 'py310 (ubuntu)'
             python: '3.10'
             toxpython: 'python3.10'
             python_arch: 'x64'
             tox_env: 'py310'
             os: 'ubuntu-latest'
-          - name: 'py310 (windows)'
-            python: '3.10'
-            toxpython: 'python3.10'
-            python_arch: 'x64'
-            tox_env: 'py310'
-            os: 'windows-latest'
-          - name: 'py310 (macos)'
-            python: '3.10'
-            toxpython: 'python3.10'
-            tox_env: 'py310'
-            os: 'macos-latest'
           - name: 'py311 (ubuntu)'
             python: '3.11'
             toxpython: 'python3.11'
             python_arch: 'x64'
             tox_env: 'py311'
             os: 'ubuntu-latest'
-          - name: 'py311 (windows)'
-            python: '3.11'
-            toxpython: 'python3.11'
-            python_arch: 'x64'
-            tox_env: 'py311'
-            os: 'windows-latest'
-          - name: 'py311 (macos)'
-            python: '3.11'
-            toxpython: 'python3.11'
-            tox_env: 'py311'
-            os: 'macos-latest'
           - name: 'pypy310 (ubuntu)'
             python: 'pypy-3.10'
             toxpython: 'pypy3.10'
             python_arch: 'x64'
             tox_env: 'pypy310'
             os: 'ubuntu-latest'
-          - name: 'pypy310 (windows)'
-            python: 'pypy-3.10'
-            toxpython: 'pypy3.10'
-            python_arch: 'x64'
-            tox_env: 'pypy310'
-            os: 'windows-latest'
-          - name: 'pypy310 (macos)'
-            python: 'pypy-3.10'
-            toxpython: 'pypy3.10'
-            tox_env: 'pypy310'
-            os: 'macos-latest'
           - name: 'pypy311 (ubuntu)'
             python: 'pypy-3.11'
             toxpython: 'pypy3.11'
             python_arch: 'x64'
             tox_env: 'pypy311'
             os: 'ubuntu-latest'
-          - name: 'pypy311 (windows)'
-            python: 'pypy-3.11'
-            toxpython: 'pypy3.11'
-            python_arch: 'x64'
-            tox_env: 'pypy311'
-            os: 'windows-latest'
-          - name: 'pypy311 (macos)'
-            python: 'pypy-3.11'
-            toxpython: 'pypy3.11'
-            tox_env: 'pypy311'
-            os: 'macos-latest'
           - name: 'py312 (ubuntu)'
             python: '3.12'
             toxpython: 'python3.12'
             python_arch: 'x64'
             tox_env: 'py312'
             os: 'ubuntu-latest'
-          - name: 'py312 (windows)'
-            python: '3.12'
-            toxpython: 'python3.12'
-            python_arch: 'x64'
-            tox_env: 'py312'
-            os: 'windows-latest'
-          - name: 'py312 (macos)'
-            python: '3.12'
-            toxpython: 'python3.12'
-            tox_env: 'py312'
-            os: 'macos-latest'
           - name: 'py313 (ubuntu)'
             python: '3.13'
             toxpython: 'python3.13'
             python_arch: 'x64'
             tox_env: 'py313'
             os: 'ubuntu-latest'
-          - name: 'py313 (windows)'
-            python: '3.13'
-            toxpython: 'python3.13'
-            python_arch: 'x64'
-            tox_env: 'py313'
-            os: 'windows-latest'
-          - name: 'py313 (macos)'
-            python: '3.13'
-            toxpython: 'python3.13'
-            tox_env: 'py313'
-            os: 'macos-latest'
           - name: 'py314 (ubuntu)'
             python: '3.14'
             toxpython: 'python3.14'
             python_arch: 'x64'
             tox_env: 'py314'
             os: 'ubuntu-latest'
-          - name: 'py314 (windows)'
-            python: '3.14'
-            toxpython: 'python3.14'
-            python_arch: 'x64'
-            tox_env: 'py314'
-            os: 'windows-latest'
-          - name: 'py314 (macos)'
-            python: '3.14'
-            toxpython: 'python3.14'
-            tox_env: 'py314'
-            os: 'macos-latest'
     steps:
     - uses: actions/checkout@v5
       with:
@@ -191,4 +92,4 @@ jobs:
       env:
         TOXPYTHON: '${{ matrix.toxpython }}'
       run: >
-        tox -e ${{ matrix.tox_env }} -v
+        tox -e ${{ matrix.tox_env }} -v
\ No newline at end of file