ci: drop test matrix, run a single Go version from go.mod

The test job ran a 1.24.x/1.25.x matrix, but go.mod requires go 1.25.0, so the
1.24 entry just auto-downloaded the 1.25 toolchain and tested the same thing
twice. Replace the matrix with a single job that sources its Go version from
go.mod via go-version-file, and reference the resolved version through the
setup-go step output in summaries, artifact names, and Codecov flags.

.github/workflows/ci.yml

@@ -35,19 +35,15 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write
-    strategy:
-      matrix:
-        go:
-          - 1.24.x
-          - 1.25.x
 
     steps:
       - uses: actions/checkout@v6
 
-      - name: Set up Go ${{ matrix.go }}
+      - name: Set up Go
+        id: setup-go
         uses: actions/setup-go@v6
         with:
-          go-version: ${{ matrix.go }}
+          go-version-file: go.mod
           check-latest: true
 
       - name: Install Task
@@ -70,7 +66,7 @@ jobs:
           {
             cat << EOF
           ## 🔧 Test Environment
-          - **Go Version:** ${{ matrix.go }}
+          - **Go Version:** ${{ steps.setup-go.outputs.go-version }}
           - **OS:** ubuntu-latest
           - **Timestamp:** $(date -u)
 
@@ -90,7 +86,7 @@ jobs:
           # Generate test summary
           {
             cat << EOF
-          ## 🧪 Test Results (Go ${{ matrix.go }})
+          ## 🧪 Test Results (Go ${{ steps.setup-go.outputs.go-version }})
 
           | Metric      | Value                                                         |
           | ----------- | ------------------------------------------------------------- |
@@ -152,7 +148,7 @@ jobs:
 
             {
               cat << EOF
-          ## 📊 Code Coverage (Go ${{ matrix.go }})
+          ## 📊 Code Coverage (Go ${{ steps.setup-go.outputs.go-version }})
 
           **Total Coverage: $COVERAGE**
 
@@ -213,7 +209,7 @@ jobs:
         if: failure()
         uses: actions/upload-artifact@v6
         with:
-          name: test-results-go-${{ matrix.go }}
+          name: test-results-go-${{ steps.setup-go.outputs.go-version }}
           path: |
             test-output.log
             coverage/
@@ -223,7 +219,7 @@ jobs:
         run: |
           {
             cat << EOF
-          ## 🔍 Static Analysis (Go ${{ matrix.go }})
+          ## 🔍 Static Analysis (Go ${{ steps.setup-go.outputs.go-version }})
 
           EOF
 
@@ -268,7 +264,7 @@ jobs:
         if: always()
         run: |
           cat >> "$GITHUB_STEP_SUMMARY" << 'EOF'
-          ## 📋 Job Summary (Go ${{ matrix.go }})
+          ## 📋 Job Summary (Go ${{ steps.setup-go.outputs.go-version }})
 
           | Step            | Status                                                          |
           | --------------- | --------------------------------------------------------------- |
@@ -284,7 +280,7 @@ jobs:
         uses: codecov/codecov-action@v5
         with:
           files: ./coverage/coverage.out
-          flags: Go ${{ matrix.go }}
+          flags: Go ${{ steps.setup-go.outputs.go-version }}
           slug: kjanat/articulate-parser
           token: ${{ secrets.CODECOV_TOKEN }}
 
@@ -292,7 +288,7 @@ jobs:
         if: ${{ !cancelled() }}
         uses: codecov/test-results-action@v1
         with:
-          flags: Go ${{ matrix.go }}
+          flags: Go ${{ steps.setup-go.outputs.go-version }}
           token: ${{ secrets.CODECOV_TOKEN }}
 
   docker-test: