Wire ambient narration through the pipeline

[dkirby-ms]

Summary

AmbientSystem narrates weather/time/atmosphere/merchant events with renderAmbientTemplate only ("cache-first LLM enhancement planned", AmbientSystem.ts:5-6). Route ambient events through NarrationService.narrate() so the living-world prose can be LLM-enhanced.

Scope / Tasks

• Inject/access NarrationService from AmbientSystem (it currently imports only ambient-templates, :25).
• For each emitted AmbientEvent (:179-212, :278), build an appropriate NarrationContext and call narrate(), using the rendered template as fallback.
• Map ambient event types to a suitable LLMNarrationType (or extend the type set if none fits) — confirm against shared/narrative-types.ts.
• Add tests asserting ambient events reach narrate() with template fallback.

Acceptance Criteria

• Ambient events emit LLM prose when configured, templates otherwise.
• Test confirms ambient narration reaches the pipeline.

Dependencies

#513; Milestone A.

Size

M

Derived from the LLM narration gap analysis (Volo) and decomposition (Elminster).