attempt retries

Author: ohmayr

.github/workflows/experiment.yaml

@@ -3,7 +3,7 @@ name: Next-Gen CI Pipeline
 on:
   pull_request:
     branches: [ main, preview ]
-  # Native Merge Queue support for O(1) batching
+  # Native Merge Queue support for exhaustive batching
   merge_group:
     types: [checks_requested]
 
@@ -20,6 +20,8 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       packages: ${{ steps.changes.outputs.all_changed_files }}
+      # Expose the dynamic Python matrix to downstream jobs
+      python_versions: ${{ steps.set-python.outputs.matrix }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -35,6 +37,17 @@ jobs:
           json: true                    
           escape_json: false
 
+      - name: Determine Python Matrix (Risk-Tiering)
+        id: set-python
+        run: |
+          if [[ "${{ github.event_name }}" == "merge_group" ]]; then
+            echo "Merge Queue detected. Deploying exhaustive matrix."
+            echo 'matrix=["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]' >> $GITHUB_OUTPUT
+          else
+            echo "Pull Request detected. Deploying Min/Max Boundary matrix."
+            echo 'matrix=["3.9", "3.14"]' >> $GITHUB_OUTPUT
+          fi
+
   # ==========================================
   # 2. STATIC ANALYSIS (Grouped for Speed)
   # ==========================================
@@ -58,7 +71,6 @@ jobs:
         run: |
           cd ${{ matrix.package }}
           export NOX_DEFAULT_VENV_BACKEND=uv
-          # Chaining sessions executes them in a single fast VM
           uvx --with 'nox[uv]' nox -s lint mypy lint_setup_py
 
   # ==========================================
@@ -87,7 +99,7 @@ jobs:
           uvx --with 'nox[uv]' nox -s docs docfx
 
   # ==========================================
-  # 4. UNIT TESTS (The 2D Multiplier Matrix)
+  # 4. UNIT TESTS (Dynamic 2D Matrix + Retries)
   # ==========================================
   unit-tests:
     needs: discover
@@ -97,7 +109,8 @@ jobs:
       fail-fast: false
       matrix:
         package: ${{ fromJSON(needs.discover.outputs.packages) }}
-        python: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        # Reads the array generated by the Discovery job
+        python: ${{ fromJSON(needs.discover.outputs.python_versions) }}
     steps:
       - uses: actions/checkout@v4
       - uses: astral-sh/setup-uv@v5
@@ -106,11 +119,24 @@ jobs:
           enable-cache: true
           cache-dependency-glob: "${{ matrix.package }}/setup.py"
 
-      - name: Execute Unit Tests
+      - name: Execute Unit Tests (With Shock Absorbers)
         run: |
           cd ${{ matrix.package }}
           export NOX_DEFAULT_VENV_BACKEND=uv
-          uvx --with 'nox[uv]' nox -s unit-${{ matrix.python }}
+          
+          # 3-Attempt retry loop to mask legacy flaky tests
+          for i in 1 2 3; do
+            echo "Attempt $i of 3 for Python ${{ matrix.python }}..."
+            if uvx --with 'nox[uv]' nox -s unit-${{ matrix.python }}; then
+              echo "Tests passed successfully!"
+              exit 0
+            fi
+            echo "Tests failed. Waiting 5 seconds before retrying..."
+            sleep 5
+          done
+          
+          echo "::error::Tests failed after 3 attempts. This is a hard failure."
+          exit 1
 
   # ==========================================
   # 5. SYSTEM TESTS
@@ -144,7 +170,6 @@ jobs:
   # 6. THE GATEKEEPER (Status Check Rollup)
   # ==========================================
   presubmit-passed:
-    # Always runs so GitHub can definitively mark the PR as passed/failed
     if: always() 
     needs: 
       - discover
@@ -161,10 +186,9 @@ jobs:
             exit 1
           fi
           
-          # If the router output was empty, it means no Python code changed.
           if [[ "${{ needs.discover.outputs.packages }}" == "[]" ]]; then
             echo "No Python packages changed. Safely bypassing execution."
             exit 0
           fi
           
-          echo "All dynamically generated CI jobs completed successfully."
+          echo "All dynamically generated CI jobs completed successfully."