Split CI lint stage into parallel jobs

ruff check, ruff format check, ty check, and pytest now run as four
independent jobs instead of one sequential lint job gating test —
faster wall-clock CI since none of these checks depend on each other.
build still waits on all four before bumping/publishing.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -7,8 +7,8 @@ name: CI
     branches: [master]
 
 jobs:
-  lint:
-    name: Lint & type check
+  ruff-check:
+    name: Lint (ruff check)
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -17,12 +17,31 @@ jobs:
           enable-cache: true
       - run: uv sync --extra cpu --extra dev
       - run: uv run ruff check .
+
+  ruff-format:
+    name: Format (ruff format)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+      - run: uv sync --extra cpu --extra dev
       - run: uv run ruff format --check .
+
+  type-check:
+    name: Type check (ty)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+      - run: uv sync --extra cpu --extra dev
       - run: uv run ty check .
 
   test:
     name: Tests
-    needs: lint
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -34,7 +53,7 @@ jobs:
 
   build:
     name: Bump version, build & publish wheel
-    needs: [lint, test]
+    needs: [ruff-check, ruff-format, type-check, test]
     if: github.event_name == 'push' && github.ref == 'refs/heads/master'
     runs-on: ubuntu-latest
     steps: