chore: sync vendored Comfy API v2 spec (cloud@941d631)

[comfy-pr-bot]

Automated sync of the public Comfy API v2 spec,
projected from the canonical contract (internal notes stripped).
Source: cloud@941d631.

It lands at spec/openapi.yaml and is a contract of its
own — it is never merged into another vendored spec in this repo.

This is the single rolling sync pull request for spec/openapi.yaml. It lives
on chore/sync-v2-spec, and every later change to the upstream contract
force-updates this same branch and refreshes this description with the
new source commit — so there is only ever one open sync PR for this
spec, and its diff is always the current one.

Please do not push commits to this branch: the next sync would
overwrite them. (It will not do so silently — the workflow checks the
branch first and fails, naming this pull request, if it finds a commit
it did not make.) Push follow-up work to a branch of your own instead.

No regen commit needed. This sync ran bash scripts/gen_models.sh against the
vendored spec and committed what it produced, so the generated low
layer in this pull request is already in step with
spec/openapi.yaml and this repository's spec-drift check should be green as
opened.

Green is not a substitute for reading the diff. The drift check
confirms only that the vendored spec and the generated low layer
agree with each other — it says nothing about whether either is what
the contract change meant, and the generated bytes were produced
upstream, by a generator this repository does not run. Review the
generated diff as you would any other.

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