Merge system-optimization IR contracts and retire legacy engine adapter

.github/workflows/solver-regression.yml

@@ -1,58 +1,31 @@
-name: Solver regression
+name: Native backend regression
 
 on:
   push:
     paths:
-      - "app/simulation/**"
+      - "app/**"
+      - "native/**"
+      - "schemas/**"
       - "tests/**"
-      - "requirements.txt"
+      - "requirements*.txt"
       - "constraints/**"
       - ".python-version"
       - ".gitattributes"
-      - "README.md"
       - ".github/workflows/solver-regression.yml"
   pull_request:
     paths:
-      - "app/simulation/**"
+      - "app/**"
+      - "native/**"
+      - "schemas/**"
       - "tests/**"
-      - "requirements.txt"
+      - "requirements*.txt"
       - "constraints/**"
       - ".python-version"
       - ".gitattributes"
-      - "README.md"
       - ".github/workflows/solver-regression.yml"
   schedule:
-    - cron: "17 3 * * 1-6"
-    - cron: "17 3 * * 0"
+    - cron: "17 3 * * *"
   workflow_dispatch:
-    inputs:
-      suite:
-        description: Regression tier
-        required: true
-        default: quick
-        type: choice
-        options:
-          - quick
-          - historical
-          - main-long
-      case:
-        description: Longest main-model horizon (predecessors run first)
-        required: true
-        default: 0.2s
-        type: choice
-        options:
-          - 0.2s
-          - 1s
-          - 5s
-          - 10s
-      lane:
-        description: Output sampling lane
-        required: true
-        default: production
-        type: choice
-        options:
-          - solver-only
-          - production
 
 concurrency:
   group: solver-regression-${{ github.ref }}-${{ github.event_name }}
@@ -62,142 +35,67 @@ permissions:
   contents: read
 
 jobs:
-  fixture-byte-contract:
-    if: >-
-      github.event_name == 'push' ||
-      github.event_name == 'pull_request' ||
-      (github.event_name == 'workflow_dispatch' && inputs.suite == 'quick')
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-24.04
-          - windows-2022
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 5
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version-file: .python-version
-      - name: Verify portable regression fixture bytes
-        run: python -m unittest tests.test_regression_fixture_line_endings
-
-  quick:
-    if: >-
-      github.event_name == 'push' ||
-      github.event_name == 'pull_request' ||
-      (github.event_name == 'workflow_dispatch' && inputs.suite == 'quick')
+  contracts:
     runs-on: ubuntu-24.04
-    timeout-minutes: 15
+    timeout-minutes: 10
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version-file: .python-version
           cache: pip
-          cache-dependency-path: |
-            requirements.txt
-            constraints/python312-direct.txt
-            constraints/python312-linux-x86_64.lock
-      - name: Install hashed Linux release lock
+          cache-dependency-path: constraints/python312-linux-x86_64.lock
+      - name: Install backend runtime without numerical Python packages
         run: |
-          python -m pip install \
-            --force-reinstall \
-            -r constraints/python312-linux-x86_64.lock
+          python -m pip install -r constraints/python312-linux-x86_64.lock
           python -m pip check
-      - name: Run solver foundation tests
+      - name: Validate portable metadata and IR contracts
         env:
           SYSTEM_SIMULATION_VERIFY_LOCKED_ENV: "1"
         run: |
           python -W error::ResourceWarning -m unittest \
             tests.test_dependency_constraints \
-            tests.test_benchmark_regression \
-            tests.test_physical_state_v21 \
-            tests.test_test_mql_ame_contract \
-            tests.test_test_mql_8_regression \
-            tests.test_mql_full_branches_regression \
-            tests.test_pressure_flow_causal_execution \
-            tests.test_stream_pressure_block_solver \
-            tests.test_core_solver \
-            tests.test_supported_piston_tangent \
-            tests.test_three_piston_tangent \
-            tests.test_sparse_secant_jacobian \
-            tests.test_generic_jacobian_sparsity \
-            tests.test_generic_system_xml_simulation
+            tests.test_regression_fixture_line_endings \
+            tests.test_component_catalog \
+            tests.test_component_metadata \
+            tests.test_component_registry \
+            tests.test_medium_reference_contract \
+            tests.test_system_xml_v3 \
+            tests.test_system_numeric_ir_v2 \
+            tests.test_native_only_backend
 
-  historical-nightly:
-    if: >-
-      (github.event_name == 'schedule' && github.event.schedule == '17 3 * * 1-6') ||
-      (github.event_name == 'workflow_dispatch' && inputs.suite == 'historical')
-    runs-on: ubuntu-24.04
-    timeout-minutes: 15
+  native-windows:
+    runs-on: windows-2022
+    timeout-minutes: 30
+    defaults:
+      run:
+        shell: pwsh
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: conda-incubator/setup-miniconda@v3
         with:
-          python-version-file: .python-version
-          cache: pip
-          cache-dependency-path: |
-            requirements.txt
-            constraints/python312-direct.txt
-            constraints/python312-linux-x86_64.lock
-      - name: Install hashed Linux release lock
+          python-version: "3.12"
+          activate-environment: simulation-native
+          auto-activate-base: false
+      - name: Install native compiler and SUNDIALS
         run: |
-          python -m pip install \
-            --force-reinstall \
-            -r constraints/python312-linux-x86_64.lock
+          conda install --yes -c conda-forge sundials=7.4.0 m2w64-gcc
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+          "SUNDIALS_ROOT=$env:CONDA_PREFIX\Library" >> $env:GITHUB_ENV
+          "SIMULATION_NATIVE_CC=$env:CONDA_PREFIX\Library\mingw-w64\bin\gcc.exe" >> $env:GITHUB_ENV
+          python -m pip install -r requirements-test.txt
           python -m pip check
-      - name: Run 0.81 and 2.10 second historical regression
+      - name: Run catalog, numerical, API and schema regression
         run: |
-          mkdir -p artifacts
-          python -m app.simulation.benchmark_regression \
-            --manifest tests/baselines/simulation/test_mql_full_branches/manifest.json \
-            --lane production \
-            --output artifacts/test-mql-full-branches.json
+          python -c "from app.simulation.native_codegen.build import toolchain; print(toolchain())"
+          if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+          python -W error::ResourceWarning -m unittest discover -s tests
+      - name: Complete the 10 second skill fixture in native RK45
+        run: |
+          python -m app.simulation.native_codegen tests/data/native-skill-test.xml --output-dir test/ci-skill --method RK45 --max-step 0.001 --rtol 1e-7 --runs 1 --solve-only
       - if: always()
         uses: actions/upload-artifact@v4
         with:
-          name: historical-solver-regression
-          path: artifacts/*.json
-          if-no-files-found: warn
-
-  main-periodic:
-    if: >-
-      (github.event_name == 'schedule' && github.event.schedule == '17 3 * * 0') ||
-      (github.event_name == 'workflow_dispatch' && inputs.suite == 'main-long')
-    runs-on: ubuntu-24.04
-    timeout-minutes: 180
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version-file: .python-version
-          cache: pip
-          cache-dependency-path: |
-            requirements.txt
-            constraints/python312-direct.txt
-            constraints/python312-linux-x86_64.lock
-      - name: Install hashed Linux release lock
-        run: |
-          python -m pip install \
-            --force-reinstall \
-            -r constraints/python312-linux-x86_64.lock
-          python -m pip check
-      - name: Run bounded progressive main-model regression
-        env:
-          REQUESTED_CASE: ${{ github.event_name == 'workflow_dispatch' && inputs.case || '10s' }}
-          REQUESTED_LANE: ${{ github.event_name == 'workflow_dispatch' && inputs.lane || 'production' }}
-        run: |
-          mkdir -p artifacts
-          python -m app.simulation.benchmark_regression \
-            --manifest tests/baselines/simulation/test_mql_8/manifest.json \
-            --lane "$REQUESTED_LANE" \
-            --case "$REQUESTED_CASE" \
-            --output artifacts/test-mql-8-progressive.json
-      - if: always()
-        uses: actions/upload-artifact@v4
-        with:
-          name: main-model-progressive-regression
-          path: artifacts/*.json
+          name: native-skill-regression
+          path: test/ci-skill/summary.json
           if-no-files-found: warn