lingbot: add 1-step speed presets, 2.2x speed up inspired by PDD

[wenqingw-nv]

Adds single-solver-step speed presets for the LingBot-World distilled checkpoints. The distilled schedule is front-loaded (all four solver steps sit at sigma >= 0.83; at identity the first step's flow matches the 4-step integrated mean velocity to ~97%), so a single step reaches quality parity at ~2.2-2.6x lower chunk latency. Found while evaluating PDD-style mean-velocity distillation (Parallel Decoding Distillation, arXiv 2607.26004) on this host: the first step's flow already captures ~97% of the 4-step trajectory's mean velocity, so the speedup needs no distillation — a config-only preset suffices.

Contents

• lingbot-world-fast-1step — 1-step preset on the Wan-VAE decoder slug.
• lingbot-world-fast-taehv-window15-sink3-1step — 1-step mode on the LightTAE window=15 + sink=3 interactive preset.
• Config-only (derive_config scheduler override: num_inference_steps=1, denoising_timesteps=[1000]); registered entry points; README slug-table rows.
• ci_cpu test asserting the 1-step schedule equals the 4-step schedule's first (t, sigma) for both presets.

Measured (464x832, 40-chunk ≈30 s held-out rollouts, GB300; 18 cells)

config	MUSIQ	late-20% MUSIQ	Delta-drift	per-chunk
4-step (lingbot-world-fast)	58.84	54.52	+8.27	1.80 s
1-step	58.86	54.42	+8.01	0.81 s (2.2x)

Interactive preset (taehv window15/sink3, 21-block runs): ~1.2 s -> ~0.45 s per chunk (~2.6x, ~30 fps effective at 464x832).

Deploy notes

• Drift behavior is unchanged vs 4-step (Delta +8.01 vs +8.27) — this is a latency preset, not a quality change; the 4-step slugs remain the defaults.
• No new weights, no checkpoint changes; both presets derive from the shipped pipeline configs.

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[greptile-apps]

Greptile Summary

The PR adds two optional one-step LingBot-World runner presets while retaining the existing four-step defaults.

• Derives Wan-VAE and LightTAE presets with a single scheduler timestep.
• Registers both presets as package entry points and documents their public slugs.
• Adds CPU smoke coverage confirming that each one-step schedule matches its four-step counterpart’s initial timestep and sigma.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
integrations/lingbot/lingbot/config.py	Adds two derived one-step pipeline and runner configurations and includes them in the local registries.
integrations/lingbot/pyproject.toml	Registers the two new runner slugs against their matching configuration attributes.
integrations/lingbot/tests/test_smoke.py	Verifies both one-step scheduler configurations and their equality with the initial four-step schedule point.
integrations/lingbot/README.md	Documents the two optional one-step preset slugs and their intended latency characteristics.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  User[Runner slug] --> EntryPoint[Package entry point]
  EntryPoint --> Runner[RunnerConfig]
  Runner --> Pipeline[Derived LingBot pipeline]
  Pipeline --> Scheduler[FlowMatch scheduler]
  Scheduler --> Step[Single denoising step at first four-step schedule point]

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[wenqingw-nv]

/ok to test 589dedb