HF_RUNTIME_FIX_RECEIPT_4.md

# HF Runtime Fix Receipt 4

## Packet
HF_Substrate_Video_Atomization_Runtime_v0_1_PATCHED6

## Error addressed
The Hugging Face build failed before container startup because the Space metadata requested one Gradio version while `requirements.txt` requested another:

```text
The user requested gradio==4.44.0
The user requested gradio==4.44.1
ResolutionImpossible
```

## Cause
Hugging Face Spaces reads `sdk_version` from the README front matter and injects `gradio[oauth]==<sdk_version>` into the build command. The prior packet changed `requirements.txt` to `gradio==4.44.1` but left README metadata at `sdk_version: 4.44.0`, creating a hard resolver conflict.

## Fix applied
1. Updated README Space metadata from `sdk_version: 4.44.0` to `sdk_version: 4.44.1`.
2. Kept `requirements.txt` at `gradio==4.44.1` so the SDK metadata and dependency file now agree.
3. Replaced the final bare `demo.launch()` with explicit Hugging Face binding:

```python
demo.launch(
    server_name="0.0.0.0",
    server_port=int(os.environ.get("PORT", "7860")),
    show_error=True,
)
```

## Boundary
No atomization logic, hashing logic, frame sampling, scene detection, trace-stack construction, HIR/OAM receipt generation, or packet-generation logic was changed.