The DB-driven instruction template, or null/undefined when unavailable.
The aggregated progress digest (one or more updates, oldest first).
Optionaloptions: NarrationBuildOptionsPrior narrations + update number for phrasing variation/chaining.
The complete spoken-update instruction text.
Builds the narration instructions from the server-provided template by substituting
{{ progressMessage }},{{ priorNarrations }}, and{{ updateNumber }}(space and no-space variants). Falls back to DefaultNarrationInstructions when the template is absent or blank (deployments that haven't synced the narration prompt).