docs: rewrite README and fix injector formatting

tests/injector-format.mjs

@@ -0,0 +1,58 @@
+import assert from "node:assert/strict";
+import { formatInjection } from "../injector.js";
+import { DEFAULT_NODE_SCHEMA } from "../schema.js";
+
+const coreEvent = {
+  id: "event-1",
+  type: "event",
+  fields: {
+    summary: "艾琳在钟楼发现了地下入口",
+    participants: "艾琳",
+    status: "resolved",
+  },
+};
+
+const recalledCharacter = {
+  id: "char-1",
+  type: "character",
+  fields: {
+    name: "艾琳",
+    state: "警觉并准备进入地下室",
+    goal: "调查钟楼秘密",
+  },
+};
+
+const recalledReflection = {
+  id: "reflection-1",
+  type: "reflection",
+  fields: {
+    insight: "地下入口意味着先前的失踪案与钟楼存在长期关联",
+    trigger: "钟楼发现暗门",
+    suggestion: "后续优先追查地下通道与失踪人口名单",
+  },
+};
+
+const text = formatInjection(
+  {
+    coreNodes: [coreEvent],
+    recallNodes: [recalledCharacter, recalledReflection],
+    groupedRecallNodes: {
+      state: [recalledCharacter],
+      episodic: [],
+      reflective: [recalledReflection],
+      rule: [],
+      other: [],
+    },
+  },
+  DEFAULT_NODE_SCHEMA,
+);
+
+assert.match(text, /\[Memory - Core\]/);
+assert.match(text, /event_table:/);
+assert.match(text, /\[Memory - Recalled\]/);
+assert.match(text, /## 当前状态记忆/);
+assert.match(text, /## 反思与长期锚点/);
+assert.match(text, /character_table:/);
+assert.match(text, /reflection_table:/);
+
+console.log("injector-format tests passed");