feat(world): annotate lamp/matches/letter for read/light/extinguish

Adds the new schema flags and per-state body sections so the dispatcher's
new verb handlers have content to narrate.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/world/items/matches.md

@@ -3,6 +3,13 @@ id: matches
 names: ["matches", "safety matches", "box"]
 short: "a box of safety matches"
 takeable: true
+lighter: true
+lighterUses: 4
+initialState:
+  uses: 4
 ---
 
 A small cardboard box of safety matches. Half-full.
+
+## lighter-empty
+The last match flares, burns down, and goes out. The book is empty.