refactor: replace Headless with minimal Eval kernel

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,5 +1,5 @@
 name: Bug report
-description: Report a defect in Maka (Desktop, TUI/CLI, or Headless)
+description: Report a defect in Maka (Desktop, TUI/CLI, Runtime Host, or Eval)
 labels: ["bug"]
 body:
   - type: textarea
@@ -29,7 +29,7 @@ body:
       placeholder: |
         - Maka version or commit:
         - OS and version:
-        - Surface: Desktop / TUI / CLI / Headless
+        - Surface: Desktop / TUI / CLI / Runtime Host / Eval
         - Node.js version, if running from source:
     validations:
       required: true

.github/workflows/ci.yml

@@ -16,7 +16,6 @@ jobs:
     outputs:
       code: ${{ steps.plan.outputs.code }}
       e2e: ${{ steps.plan.outputs.e2e }}
-      headless: ${{ steps.plan.outputs.headless }}
       runtime_host: ${{ steps.plan.outputs.runtime_host }}
       runtime_sandbox: ${{ steps.plan.outputs.runtime_sandbox }}
       script_mode: ${{ steps.plan.outputs.script_mode }}
@@ -152,46 +151,16 @@ jobs:
       - name: Run Runtime Host tests
         run: npm --workspace @maka/runtime-host run test:dist
 
-  test_headless:
-    needs: changes
-    if: needs.changes.outputs.headless == 'true'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
-        with:
-          node-version: '24'
-          cache: npm
-      - uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v9.0.0
-      - name: Install pinned Harbor contract runtime
-        run: |
-          uv tool install "harbor==0.13.2"
-          uv tool dir --bin >> "$GITHUB_PATH"
-      - name: Install Linux runtime dependencies
-        run: sudo apt-get update && sudo apt-get install -y ripgrep bubblewrap
-      - run: npm ci
-      - run: npm run build:test
-      - name: Run Headless tests
-        env:
-          MAKA_REQUIRE_HARBOR_CONTRACT: '1'
-        run: npm --workspace @maka/headless run test:dist
-      # The Harbor adapters are Python, so their contracts cannot ride the
-      # workspace suite. This one needs only the stdlib.
-      - name: Run Harbor adapter tests
-        run: python3 packages/headless/harbor/tests/test_process_scope.py
-
   # Preserve one stable required check while letting independent heavy suites
   # occupy their own runners. The aggregator waits for every selected lane.
   test:
-    needs: [changes, test_workspaces, test_runtime_host, test_headless]
+    needs: [changes, test_workspaces, test_runtime_host]
     if: always()
     runs-on: ubuntu-latest
     steps:
       - name: Require successful test lanes
         env:
           CHANGES_RESULT: ${{ needs.changes.result }}
-          HEADLESS_RESULT: ${{ needs.test_headless.result }}
-          HEADLESS_SELECTED: ${{ needs.changes.outputs.headless }}
           RUNTIME_HOST_RESULT: ${{ needs.test_runtime_host.result }}
           RUNTIME_HOST_SELECTED: ${{ needs.changes.outputs.runtime_host }}
           SCRIPT_MODE: ${{ needs.changes.outputs.script_mode }}
@@ -221,7 +190,6 @@ jobs:
           fi
           require_lane "workspace tests" "$workspaces_selected" "$WORKSPACES_RESULT"
           require_lane "Runtime Host tests" "$RUNTIME_HOST_SELECTED" "$RUNTIME_HOST_RESULT"
-          require_lane "Headless tests" "$HEADLESS_SELECTED" "$HEADLESS_RESULT"
 
   # One Electron job: install once, run the (now small) e2e suite, then the
   # CDP alignment audit against the same built renderer. Dual shards plus a