chore: consolidate CI workflows (#134)

- Rename go.yml to test.yml (workflow name: Test)
- Rename golangci-lint.yml to lint.yml (workflow name: Lint)
- Delete redundant ci.yml
- Move vet from OS matrix to single Ubuntu job
- Move format-check from ci.yml to test.yml

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <[email protected]>

Author: osteele

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: golangci-lint
+name: Lint
 
 on:
   push:
@@ -11,8 +11,7 @@ permissions:
   pull-requests: read
 
 jobs:
-  golangci:
-    name: lint
+  lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4

.github/workflows/golangci-lint.yml .github/workflows/lint.yml.github/workflows/golangci-lint.yml renamed to .github/workflows/lint.yml

@@ -1,4 +1,4 @@
-name: Build Status
+name: Test
 
 on:
   push:
@@ -31,11 +31,62 @@ jobs:
     - name: Build
       run: make build
 
+    - name: Test
+      run: make test
+
+  vet:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Install Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: 1.24.x
+
+    - name: Install dependencies
+      run: make deps
+
     - name: Run go vet
       run: make vet
 
-    - name: Test
-      run: make test
+  format-check:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Install Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: 1.24.x
+
+    - name: Check formatting
+      run: |
+        make fmt
+        if [ -n "$(git status --porcelain)" ]; then
+          echo "Code is not formatted. Please run 'make fmt'"
+          git diff
+          exit 1
+        fi
+
+  verify-mod:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Install Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: 1.24.x
+
+    - name: Check go.mod
+      run: make check-mod
 
   coverage:
     runs-on: ubuntu-latest
@@ -83,18 +134,3 @@ jobs:
         echo "" >> $GITHUB_STEP_SUMMARY
         echo "### Per-package coverage:" >> $GITHUB_STEP_SUMMARY
         go tool cover -func=coverage.out | grep -v "total:" | awk '{printf "- %s: %s\n", $2, $3}' >> $GITHUB_STEP_SUMMARY
-
-  verify-mod:
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v4
-
-    - name: Install Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: 1.24.x
-
-    - name: Check go.mod
-      run: make check-mod