From 43edacb4dd0c1ff0ae89289a101aba28cb39ed23 Mon Sep 17 00:00:00 2001
From: Howard Huang <hao@hwrd.me>
Date: Fri, 29 May 2026 01:06:24 -0500
Subject: [PATCH] CHORE: Split CI into separate test and rubocop jobs
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What: Replaces the single `build` job that ran `bundle exec rake`
with two parallel jobs — `test` (runs `bundle exec rake test`) and
`rubocop` (runs `bundle exec rake rubocop`). Workflow renamed
Ruby -> CI to reflect the broader scope.

Why: Separate jobs give clearer signal in PR check lists
(test/rubocop failures are distinct red Xs instead of one combined
status), and they execute in parallel — faster feedback per PR.

Also adds:
- concurrency block keyed on workflow + ref, with
  cancel-in-progress so a force-push to a PR cancels the previous
  in-flight run instead of doubling CI usage.
- fail-fast: false on the test matrix so a single Ruby version
  failure doesn't cancel siblings (useful once the matrix grows
  past the current single 4.0.5 entry).

Same Ruby version (4.0.5), same actions/checkout@v6 and
ruby/setup-ruby@v1 with bundler-cache enabled.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 .github/workflows/main.yml | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 720cd42..f70daca 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,24 +1,27 @@
-name: Ruby
+name: CI
 
 on:
   push:
     branches:
       - main
-
   pull_request:
 
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
-    name: Ruby ${{ matrix.ruby }}
+    name: Test (Ruby ${{ matrix.ruby }})
     strategy:
+      fail-fast: false
       matrix:
         ruby:
           - '4.0.5'
-
     steps:
       - uses: actions/checkout@v6
         with:
@@ -28,5 +31,20 @@ jobs:
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
-      - name: Run the default task
-        run: bundle exec rake
+      - name: Run tests
+        run: bundle exec rake test
+
+  rubocop:
+    runs-on: ubuntu-latest
+    name: Rubocop
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '4.0.5'
+          bundler-cache: true
+      - name: Run Rubocop
+        run: bundle exec rake rubocop