docs: use YouTube demo link

Co-authored-by: Codex <codex@openai.com>

README.md

@@ -59,7 +59,7 @@ of a continuously refreshed project atlas, and every advisor response is grounde
 - Live app: <https://build-small-hackathon-hackathon-advisor.hf.space>
 - Hugging Face Space: <https://huggingface.co/spaces/build-small-hackathon/hackathon-advisor>
 - Source code (GitHub): <https://github.com/JacobLinCool/hackathon-advisor>
-- Demo video: <https://build-small-hackathon-hackathon-advisor.hf.space/static/assets/hackathon-advisor-demo.mp4>
+- Demo video: <https://youtu.be/Gq-FUiL-ZPw>
 - Social post draft: [`docs/social-post.md`](docs/social-post.md) - publish it, then replace this line with the
   public post URL before the final form submission.
 - Submission notes: [`docs/submission-notes.md`](docs/submission-notes.md)

docs/article.md

@@ -1,7 +1,7 @@
 # Hackathon Advisor: A Living Field Guide for Build Small
 
 Demo: <https://build-small-hackathon-hackathon-advisor.hf.space>  
-Demo video: <https://build-small-hackathon-hackathon-advisor.hf.space/static/assets/hackathon-advisor-demo.mp4>  
+Demo video: <https://youtu.be/Gq-FUiL-ZPw>  
 Repository: <https://github.com/JacobLinCool/hackathon-advisor>  
 Space: <https://huggingface.co/spaces/build-small-hackathon/hackathon-advisor>
 

docs/social-post.md

@@ -43,7 +43,7 @@ Codex helped throughout the build: implementation planning, code changes, tests,
 submission notes, README polish, and commit history with Codex co-author attribution.
 
 Demo: https://build-small-hackathon-hackathon-advisor.hf.space  
-Demo video: https://build-small-hackathon-hackathon-advisor.hf.space/static/assets/hackathon-advisor-demo.mp4  
+Demo video: https://youtu.be/Gq-FUiL-ZPw  
 GitHub: https://github.com/JacobLinCool/hackathon-advisor
 
 #BuildSmall #Gradio #HuggingFace #OpenAICodex #MiniCPM #Nemotron #Modal

docs/submission-notes.md

@@ -6,7 +6,7 @@ Official guide: <https://build-small-hackathon-field-guide.hf.space/submit>
 Live app: <https://build-small-hackathon-hackathon-advisor.hf.space>  
 Space: <https://huggingface.co/spaces/build-small-hackathon/hackathon-advisor>  
 GitHub: <https://github.com/JacobLinCool/hackathon-advisor>  
-Demo video: <https://build-small-hackathon-hackathon-advisor.hf.space/static/assets/hackathon-advisor-demo.mp4>
+Demo video: <https://youtu.be/Gq-FUiL-ZPw>
 
 ## Official Checklist
 
@@ -14,7 +14,7 @@ Demo video: <https://build-small-hackathon-hackathon-advisor.hf.space/static/ass
 | --- | --- | --- |
 | Stay under 32B | Ready | All runtime models are below 4B; the full stack is documented at `/api/prize-ledger` and in `README.md`. |
 | Ship a Gradio app in the official org | Ready | Public Gradio Space: `build-small-hackathon/hackathon-advisor`; `/health` returns 200. |
-| Record a demo | Ready | Final demo video is committed at `static/assets/hackathon-advisor-demo.mp4` and served by the Space. |
+| Record a demo | Ready | Final demo video is uploaded to YouTube; a Space-hosted MP4 backup remains committed at `static/assets/hackathon-advisor-demo.mp4`. |
 | Post it | Needs user action | Draft is in `docs/social-post.md`; publish it manually and replace the README draft link with the public post URL. |
 | Mind the GPU limit | Ready | Uses one ZeroGPU Space (`zero-a10g`) for this submission. |
 | Tag README | Ready | README front matter uses official `track:*`, `sponsor:*`, and `achievement:*` tags. |