Add fake demo runtime vertical slice

[jarcherNV]

No description provided.

[greptile-apps]

Greptile Summary

The PR adds a shared fake demo-runtime vertical slice and adopts it across replay and WebRTC paths, including model-worker lifecycle hardening and OmniDreams integration.

• Introduces batch and realtime session drivers, run modes, validation, timing, output sinks, metrics, and warmup primitives.
• Expands shared WebRTC encoding, media, service, and lifecycle infrastructure.
• Adds OmniDreams demo adapters, replay/WebRTC entry points, artifact validation workflow, and broad runtime test coverage.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
flashdreams/flashdreams/runtime/demo/drivers.py	Adds batch and realtime session orchestration with cancellation-resistant, worker-affine cleanup and host quarantine on cleanup failure.
flashdreams/flashdreams/runtime/demo/run_modes.py	Defines session edges, admission, error policies, metrics, results, and warmup behavior used by the new drivers.
flashdreams/flashdreams/runtime/demo/host.py	Adds runtime-host lifecycle, model-worker dispatch, health tracking, and warmup coordination.
flashdreams/flashdreams/serving/webrtc/manager.py	Integrates the shared demo runtime into WebRTC session management and transport lifecycle.
integrations/omnidreams/omnidreams/demo/runtime.py	Adapts OmniDreams model execution to the shared demo runtime contracts.
.github/workflows/omnidreams-demo-runtime.yml	Adds GPU CI coverage for null, precomputed MP4, and Ludus replay modes with output validation.

Sequence Diagram

sequenceDiagram
  participant Client
  participant Mode as Demo Run Mode
  participant Driver as Session Driver
  participant Host as Runtime Host
  participant Model as Model Session
  participant Output as Output Sink
  Mode->>Driver: run session
  Driver->>Host: create provider and session
  Host->>Model: execute model-affine work
  loop Each step
    Driver->>Host: execute pipeline step
    Host->>Model: generate output
    Model-->>Output: frames or artifacts
  end
  Driver->>Host: close session and provider
  Driver->>Output: finalize result
  alt Cleanup fails or times out
    Driver->>Host: mark unhealthy
    Host-->>Mode: reject subsequent admission
  end

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