Create a new workflow from a template

Creates a brand-new workflow in the caller's WORKSPACE from an org template. The template is unchanged, and the two are not linked afterwards.

The new workflow is always a DRAFT: it has no published version and no trigger goes live until you publish it separately. description and triggerType are copied from the template.

BODY IS OPTIONAL. Send {"name": "..."} to override the name; send nothing (or a blank name) and the template's own name is used. A resolved name over 255 characters is a 400.

CONNECTION REFERENCES ARE RESOLVED AGAINST THIS WORKSPACE. Connections are workspace-scoped, so a template saved elsewhere can carry connectionIds that mean nothing here. Every reference this workspace cannot resolve is CLEARED (set to null) and that step is marked valid: false, so the new workflow arrives visibly incomplete rather than looking wired to something that resolves to nothing at run time. Expect to re-attach connections (by id) after using a cross-workspace template. The clearing walks the trigger, every action, branch arms, loop bodies and error arms.

PIECE VERSIONS: the snapshot keeps whatever version pins the source flow had; only steps that were never pinned pick up the fleet's current version. If the template references a piece — or a pinned piece VERSION — this instance's worker fleet cannot run, the call is refused 422 rather than minting a workflow whose steps would fail at run time.

Accepts Idempotency-Key, so a retry after a dropped connection replays the first response instead of creating a second workflow.