Thrown when a start fails AFTER its create committed but BEFORE priming:
the instance document exists, unprimed (see isUnprimed) — a
genuinely failed start, but a RESUMABLE one. The error names the id so
every surface's failure message can point at the retry rail: retrying
startInstance with this instanceId finishes the start instead of
creating a duplicate; aborting the instance discards it.
Thrown when a start fails AFTER its create committed but BEFORE priming: the instance document exists, unprimed (see isUnprimed) — a genuinely failed start, but a RESUMABLE one. The error names the id so every surface's failure message can point at the retry rail: retrying
startInstancewith thisinstanceIdfinishes the start instead of creating a duplicate; aborting the instance discards it.