Restore workflow-level concurrency for full run cancellation

New pushes should cancel all stale jobs to free limited runners.
Per-job concurrency was overly granular — old Phoenix/Github jobs
kept running even when a new push made them irrelevant.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

.github/workflows/test.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   lint-gate:
     name: Lint Gate
@@ -64,9 +68,6 @@ jobs:
     name: Github
     if: needs.file-changes.outputs.checkall == 'true'
     needs: [lint-gate, file-changes]
-    concurrency:
-      group: github-${{ github.ref }}-${{ matrix.os }}-${{ matrix.mpi }}-${{ matrix.debug }}-${{ matrix.intel }}
-      cancel-in-progress: true
     strategy:
       matrix:
         os:    ['ubuntu', 'macos']
@@ -143,9 +144,6 @@ jobs:
     name: "${{ matrix.cluster_name }} (${{ matrix.device }}${{ matrix.interface != 'none' && format('-{0}', matrix.interface) || '' }})"
     if: github.repository == 'MFlowCode/MFC' && needs.file-changes.outputs.checkall == 'true'
     needs: [lint-gate, file-changes]
-    concurrency:
-      group: self-${{ github.ref }}-${{ matrix.cluster }}-${{ matrix.device }}-${{ matrix.interface }}
-      cancel-in-progress: true
     continue-on-error: false
     timeout-minutes: 480
     strategy:
@@ -212,9 +210,6 @@ jobs:
     name: "Benchmark | ${{ matrix.name }} (${{ matrix.device }}${{ matrix.interface != 'none' && format('-{0}', matrix.interface) || '' }})"
     if: github.repository == 'MFlowCode/MFC' && needs.file-changes.outputs.checkall == 'true'
     needs: [lint-gate, file-changes]
-    concurrency:
-      group: bench-${{ github.ref }}-${{ matrix.cluster }}-${{ matrix.device }}-${{ matrix.interface }}
-      cancel-in-progress: true
     continue-on-error: false
     timeout-minutes: 480
     strategy: