debug(ci): override @rspack/core to traced canary + dump trace on failure

Pin @rspack/core to a canary build of rspack worktree-rstest-native-watcher
(commit 27bc1e20) so the binding writes RCA trace lines into
/tmp/rca-binding-trace.log on the runner:
  - NativeWatcher::new aggregateTimeout/poll/symlink
  - JsEventHandler::on_event_handle aggregate changedFiles/deletedFiles
  - JsEventHandlerUndelayed::on_change every undelayed path

Replace the prior tmate step with a `cat /tmp/rca-binding-trace.log`
step on failure so the dump shows up directly in the macos-14 job log
without needing an interactive SSH.

Will be reverted after the investigation; not for merge.

Author: stormslowly

.github/workflows/test.yml

@@ -223,20 +223,38 @@ jobs:
       - name: Install Playwright Browsers
         run: npx playwright install chromium webkit
 
+      # RCA debug: confirm the e2e workspace actually resolves the canary
+      # binding (root pnpm overrides should propagate, but verify before
+      # blaming binding behaviour).
+      - name: Debug — show resolved @rspack/* versions in e2e
+        if: matrix.os == 'macos-14'
+        run: |
+          echo '----- root resolved versions -----'
+          pnpm why @rspack/core -r --depth 0 || true
+          echo '----- e2e workspace lock entry -----'
+          pnpm --filter @rstest/tests why @rspack/core --depth 0 || true
+          pnpm --filter @rstest/tests why @rspack/binding-darwin-arm64 --depth 0 || true
+          echo '----- actual .node binary path/size -----'
+          find e2e/node_modules /Users/runner/work/rstest/rstest/node_modules \
+               -name 'rspack.darwin-arm64.node' 2>/dev/null | xargs -I{} ls -lh {} || true
+
       - name: E2E Test (${{ matrix.test_script }})
         run: cd e2e && pnpm ${{ matrix.test_script }}
 
-      # RCA debug: SSH into the macos-14 + node 24 runner on e2e failure
-      # so we can inspect why the watch test sees stale dist content
-      # (mode B "No test files need re-run") that we cannot reproduce
-      # locally on the same Node version. Limited to the one matrix slot
-      # that consistently fails, so other failures are not impacted.
-      - name: Setup tmate session (RCA debug)
-        if: failure() && matrix.os == 'macos-14' && matrix.node_version == '24'
-        uses: mxschmitt/action-tmate@v3
-        timeout-minutes: 30
-        with:
-          limit-access-to-actor: true
+      # RCA debug: a canary rspack build with file-level trace writes to
+      # /tmp/rca-binding-trace.log inside the runner. Dump it on failure
+      # so the actual aggregateTimeout / changedFiles / undelayed event
+      # paths seen by the binding land in the CI job log.
+      - name: Dump rspack binding RCA trace
+        if: failure() && matrix.os == 'macos-14'
+        run: |
+          echo '===== /tmp/rca-binding-trace.log ====='
+          if [ -f /tmp/rca-binding-trace.log ]; then
+            cat /tmp/rca-binding-trace.log
+          else
+            echo "(file not present)"
+          fi
+          echo '===== END trace ====='
 
       - name: VS Code Extension Test
         if: matrix.test_script == 'test'

package.json

@@ -43,5 +43,15 @@
   "engines": {
     "node": "^20.19.0 || >=22.12.0",
     "pnpm": ">=10.33.4"
+  },
+  "pnpm": {
+    "peerDependencyRules": {
+      "allowAny": [
+        "@rspack/*"
+      ]
+    },
+    "overrides": {
+      "@rspack/core": "npm:@rspack-canary/core@2.0.4-canary-708545a8-20260518031054"
+    }
   }
 }