refactor: expect 类型模型重构，Raw/Resolved 双层分离与断言基础设施内聚

- 重命名 ContentRules→ContentExpectations, KeyValueExpect→KeyedExpectations
- 新增 Raw/Resolved 双层模型：resolve 阶段物化为执行计划，store 持久化 Raw 快照
- HTTP body 按需读取：status/headers 失败或无 body expectation 时不读取 body
- 新增 displayValueExpectation() 解包 failure.expected 用户可读展示
- 修复 checkEarlyTimeout 独立 lte/lt 检查，修复 KeyedExpectations JSON Schema
- 新增 expect/value.ts(resolve/check/display)、keyed.ts、content.ts、headers.ts、status.ts
- 删除旧 normalize.ts/matcher.ts/validate-matcher.ts/key-value.ts
- 更新 DEVELOPMENT.md：expect 五层管线表、displayValueExpectation、1.7↔1.10 交叉引用
- 同步 13 个 main specs，归档 refactor-expect-type-model 变更（62/62 tasks）

tests/server/checker/runner/llm/execute.test.ts

@@ -1,8 +1,15 @@
 import { afterAll, beforeAll, describe, expect, test } from "bun:test";
 
-import type { ResolvedLlmTarget } from "../../../../../src/server/checker/runner/llm/types";
+import type {
+  RawLlmExpectConfig,
+  ResolvedLlmExpectConfig,
+  ResolvedLlmTarget,
+} from "../../../../../src/server/checker/runner/llm/types";
 import type { CheckerContext } from "../../../../../src/server/checker/runner/types";
 
+import { resolveContentExpectations } from "../../../../../src/server/checker/expect/content";
+import { resolveKeyedExpectations } from "../../../../../src/server/checker/expect/keyed";
+import { resolveValueExpectation } from "../../../../../src/server/checker/expect/value";
 import { LlmChecker } from "../../../../../src/server/checker/runner/llm/execute";
 
 const MOCK_PORT = 18456;
@@ -14,13 +21,34 @@ function makeCtx(timeoutMs = 10000): CheckerContext {
   return { signal: controller.signal };
 }
 
-function makeTarget(
-  overrides?: Partial<ResolvedLlmTarget["llm"]>,
-  expectOverrides?: Partial<ResolvedLlmTarget["expect"]>,
-): ResolvedLlmTarget {
+function makeTarget(overrides?: Partial<ResolvedLlmTarget["llm"]>, rawExpect?: RawLlmExpectConfig): ResolvedLlmTarget {
+  const resolvedExpect: ResolvedLlmExpectConfig | undefined = rawExpect
+    ? {
+        durationMs: resolveValueExpectation(rawExpect.durationMs),
+        finishReason: resolveValueExpectation(rawExpect.finishReason),
+        headers: resolveKeyedExpectations(rawExpect.headers),
+        output: resolveContentExpectations(rawExpect.output),
+        rawFinishReason: resolveValueExpectation(rawExpect.rawFinishReason),
+        status: rawExpect.status ?? [200],
+        stream: rawExpect.stream
+          ? {
+              completed: rawExpect.stream.completed ?? true,
+              firstTokenMs: resolveValueExpectation(rawExpect.stream.firstTokenMs),
+            }
+          : undefined,
+        usage: rawExpect.usage
+          ? {
+              inputTokens: resolveValueExpectation(rawExpect.usage.inputTokens),
+              outputTokens: resolveValueExpectation(rawExpect.usage.outputTokens),
+              totalTokens: resolveValueExpectation(rawExpect.usage.totalTokens),
+            }
+          : undefined,
+      }
+    : undefined;
+
   return {
     description: null,
-    expect: expectOverrides,
+    expect: resolvedExpect,
     group: "default",
     id: "test-llm",
     intervalMs: 30000,
@@ -38,6 +66,7 @@ function makeTarget(
       ...overrides,
     },
     name: null,
+    rawExpect,
     timeoutMs: 10000,
     type: "llm",
   };