gbrain init --no-embedding writes embedding_disabled: true as a
deferred-setup sentinel, and init/import/embed honor it via
assertEmbeddingEnabled. sync's embed credential preflight (v0.41.6.0 D1)
only checked the --no-embed CLI flag, so every gbrain sync on a keyless
deferred-setup brain exited 1 demanding <PROVIDER>_API_KEY — including
orchestrated callers (gstack /sync-gbrain) that never pass --no-embed.
embed-preflight.ts's own skip protocol documents that the sentinel is
owned upstream of the credential check; this wires that contract into
sync by deriving noEmbed from CLI args + config in one exported pure
helper (resolveNoEmbed), covered by test/sync-no-embed-sentinel.test.ts.
Co-authored-by: Gawie van Blerk <gawie.vanblerk@emeraldlife.co.za>
