ci: re-trigger (run 62794 wedged: Canvas Deploy Reminder storm-cancelled 2s zero-output, poisoned needs-graph so all-required Skipped+never posted; Gitea 1.22.6 no REST rerun) [no-op]

The E2E Chat job has a 100% failure rate since inception (33 failures,
0 successes across all PRs + staging HEAD). Root cause: the workflow
pinned actions/setup-node@60edb5dd... (v4), whose SHA was never
replicated into the self-hosted Gitea actions mirror
(git.moleculesai.app/actions/setup-node -> 404 reference not found).
Every run dies at action resolution, ~12s in, before any test code.

Sibling Playwright workflow e2e-staging-canvas.yml already uses the
mirrored v6.4.0 SHA 48b55a011bda... (resolves 200). Align e2e-chat.yml
to the same pin so the job can actually execute.

This is not a #1277 regression and not a code defect — E2E Chat has
never run a single test. The check is non-blocking (continue-on-error,
not yet in branch protection per the bp-required pending-#1142 note),
so no merges were gated by this.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/e2e-chat.yml

@@ -97,7 +97,7 @@ jobs:
           cache-dependency-path: workspace-server/go.sum
 
       - if: needs.detect-changes.outputs.chat == 'true'
-        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d6f5 # v4
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
           node-version: '22'
           cache: 'npm'