- Arm `oac-research-new` (trigger `researchNew`) from `_commEnded` when the `oac-research-complete` sign-off finishes and `researchAnyAvailable()` is true, so the hub FIFO plays it right behind the sign-off
- Register the new audio-only comm in `data/comms.json` and move `researchNew` out of the reserved trigger list
- Update roster count to 25 and add node checks for the beat's fields, clip presence, and zero delay in `dev/comms.test.mjs`
- Add headless browser harness (`dev/new-research-shot.html`/`.mjs`) that verifies the seam, gating (in-flight vs available), and FIFO ordering through the real `onEnd` hook
- Ship `assets/videos/arid-shop-03.mp4`
