A profile created without a clone source copies the launch profile's
`model` block so it can run. When that block points at a custom
`providers:` gateway (self-hosted / local endpoint), `model.provider:
my-gateway` alone is "Unknown provider 'my-gateway'" on the new bot's very
first turn — created, but unable to run, the same on-arrival failure
#101885 / #94071 describe for the built-in case (fixed in 01a3e9a44c).
launch_model_seed() returns the model block plus exactly that provider's
definition; both the CLI seed (_seed_model_config, also behind the
Desktop's profiles.create) and the gateway inheritance path
(_inherit_launch_model) write the same shape.
Live repro: e2e/new-bot-config-on-disk.spec.ts (New Bot → Fresh profile →
Create; asserts the created profile's config.yaml on disk and that the
intro turn completes) — red on origin/main with the banner "Unknown
provider 'mock'", green here.
b5a9efea06