Add t2v API and integrations and benchmark support

[jarcherNV]

The first model behind the v2 protocol and the first user of the batch runner and Mp4OutputSink. Output is MP4 only, so there is no input side yet. The check it runs is shared, in flashdreams.testing_v2.t2v_conformance, since every t2v model wants the same coverage. CPU tests use a stand-in model; the real one carries ci_gpu and skips unless T2V_SELF_FORCING_REAL_MODEL_RUN is set, because pytest-manual-marker fails manual tests at setup and they never run.

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[jarcherNV]

This file is just the benchmark config stuff for running the new integrations.

[greptile-apps]

Greptile Summary

This PR adds the v2 text-to-video application protocol, model integrations, MP4/metrics output, CLI discovery, and benchmark scenarios. It also extends lifecycle ownership so windows are closed when application initialization or session creation fails.

• Adds shared T2V application/session defaults and conformance coverage.
• Adds five independently packaged v2 model integrations.
• Adds MP4 benchmark output, runtime metrics, strict deterministic execution, and benchmark scenarios.
• Adds application discovery and MP4/WebRTC client-window modes to the v2 CLI.

Confidence Score: 4/5

The PR is not yet safe to merge because a timed-out WebRTC construction can leave an unreachable server thread and listening socket alive.

WebRTCServer starts its thread before waiting for readiness, but a timeout raises through mode.create without stopping that thread or returning an object the CLI can close.

Files Needing Attention: flashdreams/flashdreams/runtime_v2/cli.py and flashdreams/flashdreams/runtime_v2/serving/webrtc_server.py

Important Files Changed

Filename	Overview
flashdreams/flashdreams/runtime_v2/cli.py	Adds the v2 application CLI and mode lifecycle, but WebRTC construction failure can leave startup resources unowned.
flashdreams/flashdreams/runtime_v2/application_runner.py	Correctly closes the client window when application initialization or session creation fails before run_session takes ownership.
flashdreams/flashdreams/runtime_v2/client_window_factory.py	Centralizes MP4 and WebRTC mode creation, arguments, and user-facing run reports.
flashdreams/flashdreams/t2v_v2/application.py	Implements the shared v2 text-to-video application configuration and session factory.
flashdreams/flashdreams/t2v_v2/session.py	Implements finite T2V generation sessions and model-output adaptation.
configs/v2_model_benchmarks.json	Adds seeded quality and performance scenarios for the five v2 T2V integrations.

Sequence Diagram

sequenceDiagram
  participant User
  participant CLI as flashdreams-run-v2
  participant Mode as ClientWindowMode
  participant Server as WebRTCServer
  participant Runner as ApplicationRunner
  participant App as T2VApplication
  participant Session as T2VSession
  User->>CLI: select application and mode
  CLI->>Mode: create(parsed)
  Mode->>Server: construct and start thread
  alt startup succeeds
    Server-->>Mode: live window
    Mode-->>CLI: window
    CLI->>Runner: run(session_desc, args)
    Runner->>App: init and create_session
    Runner->>Session: run_session
    Runner-->>CLI: cleanup complete
  else startup times out
    Server--xMode: TimeoutError
    Note over Server: Thread may continue without a cleanup owner
  end

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_{Reviews (2): Last reviewed commit: "Simplified readmes" | Re-trigger Greptile}

[gtong-nv]

LGTM!