Wire look/room_description through the narration pipeline

[dkirby-ms]

Summary

The look command builds room descriptions from static room.description and templates (commands/handlers/look.ts:51-122) and never touches NarrationService. Route the full-room-description path through generateNarration('room_description', …) so players see LLM prose (with graceful template fallback).

Scope / Tasks

• Identify the full-room-description branch in commands/handlers/look.ts (the no-target look, :21-68).
• Invoke ZoneRoom.generateNarration('room_description', playerId, roomId, fallbackText) for that path; keep the current static text as the fallbackText argument.
• Ensure async generation does not block command response (mirror the join pattern at ZoneRoom.ts:598-605).
• Preserve existing behavior for darkness (look.ts:32) and feature-target look (:122) unless explicitly in scope.
• Add a wiring test (extend narration-wiring.test.ts) asserting room_description reaches narrate().

Acceptance Criteria

• A look with a configured LLM returns LLM prose; with no LLM, returns the existing template text.
• Test proves room_description is passed to NarrationService.narrate() from the look path.
• No regression in darkness / feature-look behavior.

Dependencies

#513 (real context), Milestone A (to actually see LLM output). #511 for Azure callability.

Size

M

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