refactor: 统一 expect 断言体系，引入共享 ValueMatcher/ContentRules/KeyValueExpect 模型

- 引入共享 ValueMatcher（equals/contains/regex/exists/empty/gt/gte/lt/lte）
- 引入共享 ContentRules 数组（direct/json/css/xpath 提取器）
- 引入共享 KeyValueExpect（动态键值断言，字面量等价 equals）
- maxDurationMs → durationMs: ValueMatcher（所有 checker）
- match → regex（固定无 flags）
- Ping max* → packetLossPercent/avgLatencyMs/maxLatencyMs（ValueMatcher）
- LLM finishReason/rawFinishReason → ValueMatcher
- DB 新增 result: ContentRules
- TCP banner → ContentRules 数组
- 删除旧模块：operator.ts、validate-operator.ts、duration.ts、body.ts、text.ts、output.ts
- 更新全部 checker schema/validate/expect/execute
- 更新 probe-config.schema.json、probes.example.yaml
- 更新 README.md、DEVELOPMENT.md（含 expect 字段选择规范）
- 同步 10 个 delta specs 到主 specs，归档 change

src/server/checker/runner/cmd/execute.ts

@@ -5,12 +5,12 @@ import type { CheckResult, RawTargetConfig } from "../../types";
 import type { CheckerContext, CheckerDefinition, CheckerValidationInput, ResolveContext } from "../types";
 import type { CommandExpectConfig, CommandTargetConfig, ResolvedCommandTarget } from "./types";
 
-import { checkDuration } from "../../expect/duration";
+import { checkContentRules } from "../../expect/content";
 import { errorFailure } from "../../expect/failure";
+import { checkValueMatcher } from "../../expect/matcher";
 import { parseSize } from "../../utils";
 import { checkExitCode } from "./expect";
 import { commandCheckerSchemas } from "./schema";
-import { checkTextRules } from "./text";
 import { validateCommandConfig } from "./validate";
 
 export class CommandChecker implements CheckerDefinition<ResolvedCommandTarget> {
@@ -118,7 +118,11 @@ export class CommandChecker implements CheckerDefinition<ResolvedCommandTarget>
       };
     }
 
-    const durationResult = checkDuration(durationMs, t.expect?.maxDurationMs);
+    const durationResult = checkValueMatcher(durationMs, t.expect?.durationMs, {
+      message: "durationMs mismatch",
+      path: "durationMs",
+      phase: "duration",
+    });
     if (!durationResult.matched) {
       return {
         durationMs,
@@ -131,7 +135,7 @@ export class CommandChecker implements CheckerDefinition<ResolvedCommandTarget>
     }
 
     if (t.expect?.stdout && t.expect.stdout.length > 0) {
-      const stdoutResult = checkTextRules(outputResult.stdout, t.expect.stdout, "stdout");
+      const stdoutResult = checkContentRules(outputResult.stdout, t.expect.stdout, { path: "stdout", phase: "stdout" });
       if (!stdoutResult.matched) {
         return {
           durationMs,
@@ -145,7 +149,7 @@ export class CommandChecker implements CheckerDefinition<ResolvedCommandTarget>
     }
 
     if (t.expect?.stderr && t.expect.stderr.length > 0) {
-      const stderrResult = checkTextRules(outputResult.stderr, t.expect.stderr, "stderr");
+      const stderrResult = checkContentRules(outputResult.stderr, t.expect.stderr, { path: "stderr", phase: "stderr" });
       if (!stderrResult.matched) {
         return {
           durationMs,