[Casual Forcing] Simplify the demo integration + remove runner

[ArielG-NV]

Build model then to render as a MP4 via custom code in 200LOC. Now you can integrate into MP4, WebRTC, and a Native-Slangpy-Window all in ~15LOC.

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[greptile-apps]

Greptile Summary

The PR replaces Causal-Forcing’s model-specific runners with the shared T2V application and keeps its pipeline configurations available as programmatic presets.

• Registers t2v-causal-forcing as an application entry point supporting local-window, MP4, and WebRTC outputs.
• Removes the custom runner implementation, runner entry points, and now-unused package dependencies.
• Updates smoke tests and documentation for the simplified integration.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or non-blocking defects identified in the changed integration path.

The shared application retains valid session construction, pipeline defaults, tensor layout, and entry-point discovery, while repository references and dependency metadata are consistent with removal of the custom runners.

Important Files Changed

Filename	Overview
integrations/causal_forcing/causal_forcing/t2v/app.py	Replaces the integration-specific application subclass with a direct shared T2VApplication factory using valid explicit defaults.
integrations/causal_forcing/causal_forcing/config.py	Removes runner configurations while retaining three named pipeline presets and a consistent preset registry.
integrations/causal_forcing/causal_forcing/runner.py	Deletes the custom T2V/I2V runner after application-based T2V integration and programmatic pipeline presets replace its supported roles.
integrations/causal_forcing/pyproject.toml	Replaces runner entry points with one shared-application entry point and removes dependencies unused after runner deletion.
integrations/causal_forcing/tests/test_smoke.py	Updates smoke coverage to validate pipeline naming, application defaults, and installed application discovery.
uv.lock	Synchronizes Causal-Forcing package metadata with the removed direct dependencies without changing package versions.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  User[flashdreams-run t2v-causal-forcing] --> Registry[Application entry-point registry]
  Registry --> Factory[causal_forcing.t2v.app:create_app]
  Factory --> SharedApp[Shared T2VApplication]
  SharedApp --> Preset[Chunkwise Causal-Forcing pipeline preset]
  Preset --> Output{Output backend}
  Output --> Window[Native window]
  Output --> MP4[MP4 file]
  Output --> WebRTC[WebRTC session]

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