feat(narrative): add frontend API client for world + god mode

frontend/src/api/narrative.js

@@ -40,3 +40,54 @@ export const getCharacters = (simId) => {
 export const initCharacters = (simId) => {
   return requestWithRetry(() => service.post(`/api/narrative/characters/${simId}/init`), 3, 1000)
 }
+
+// ---- World State ----
+
+/**
+ * Get the full world state (rules, locations, event log).
+ */
+export const getWorld = (simId) =>
+  service.get(`/api/narrative/world/${simId}`)
+
+/**
+ * Replace world rules with the given array of strings.
+ */
+export const setWorldRules = (simId, rules) =>
+  service.post(`/api/narrative/world/${simId}/rules`, { rules })
+
+/**
+ * Insert or update a location.
+ * @param {Object} location - { id, name, description }
+ */
+export const upsertLocation = (simId, location) =>
+  service.post(`/api/narrative/world/${simId}/locations`, location)
+
+// ---- God Mode ----
+
+/**
+ * Inject a world event. The next translate_round will surface it to the LLM.
+ * @param {string} description
+ * @param {number|null} round - optional; defaults to (last beat round + 1)
+ */
+export const injectEvent = (simId, description, round = null) =>
+  requestWithRetry(
+    () => service.post(`/api/narrative/godmode/${simId}/inject-event`, { description, round }),
+    3, 2000
+  )
+
+/**
+ * Overwrite specified emotion values for a character.
+ * @param {string} characterId
+ * @param {Object} emotions - { anger: 0.8, joy: 0.1, ... }
+ */
+export const modifyEmotion = (simId, characterId, emotions) =>
+  service.post(`/api/narrative/godmode/${simId}/modify-emotion`, {
+    character_id: characterId,
+    emotions,
+  })
+
+/**
+ * Mark a character as dead. Auto-appends a death event to the world log.
+ */
+export const killCharacter = (simId, characterId) =>
+  service.post(`/api/narrative/godmode/${simId}/kill`, { character_id: characterId })