The rename to observer-firmware is verified: the rename's own push event
ran both workflows on the new name (branch creation bypasses path
filters), sync-flasher-content pushed to the flasher repo, and the
production publish completed on observer-firmware. The transition dual
trigger is no longer needed.
Also update the MQTT_INTERNALS.md prose reference to the old branch name.
Workflow+docs-only commit: pushing this triggers no build.
agessaman
80b4e4051c