feat(qa): add e2e-tester as subagent in scheduled quality sweep (#1894)

E2E tests now run as a 4th teammate alongside test-runner,
dedup-scanner, and code-quality-reviewer during schedule-triggered
QA cycles. The standalone e2e mode is preserved for on-demand use.

- Add e2e-tester teammate to qa-quality-prompt.md
- Increase quality mode timeout from 35 to 40 min
- Add "e2e" to trigger-server valid reasons
- Re-enable daily schedule in qa.yml, default to "schedule"

Co-authored-by: spawn-bot <spawn-bot@openrouter.ai>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/qa.yml

@@ -1,20 +1,17 @@
 name: Daily QA
-# Disabled until QA VM is fixed
-# on:
-#   schedule:
-#     - cron: '0 6 * * *'
-#   workflow_dispatch:
 on:
+  schedule:
+    - cron: '0 6 * * *'
   workflow_dispatch:
     inputs:
       reason:
         description: 'QA mode to trigger'
         required: false
-        default: 'e2e'
+        default: 'schedule'
         type: choice
         options:
-          - e2e
           - schedule
+          - e2e
           - fixtures
 jobs:
   trigger:
@@ -26,7 +23,7 @@ jobs:
           SPRITE_URL: ${{ secrets.QA_SPRITE_URL }}
           TRIGGER_SECRET: ${{ secrets.QA_TRIGGER_SECRET }}
         run: |
-          REASON="${{ github.event.inputs.reason || 'e2e' }}"
+          REASON="${{ github.event.inputs.reason || 'schedule' }}"
           curl -sS --fail-with-body -X POST \
             "${SPRITE_URL}/trigger?reason=${REASON}" \
             -H "Authorization: Bearer ${TRIGGER_SECRET}"