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

probes.example.yaml

@@ -34,7 +34,8 @@ targets:
       url: "https://www.baidu.com"
     expect:
       status: [200]
-      maxDurationMs: 5000
+      durationMs:
+        lte: 5000
 
   - id: "httpbin-json"
     name: "${env_name} JSON API — 完整流水线"
@@ -51,7 +52,8 @@ targets:
       headers:
         Content-Type:
           contains: "application/json"
-      maxDurationMs: 8000
+      durationMs:
+        lte: 8000
       body:
         - json:
             path: "$.slideshow.title"
@@ -92,7 +94,7 @@ targets:
     expect:
       exitCode: [0]
       stdout:
-        - match: "^\\d+\\.\\d+\\.\\d+"
+        - regex: "^\\d+\\.\\d+\\.\\d+"
 
   - id: "bun-stdout-rules"
     name: "多规则 stdout 顺序校验"
@@ -104,7 +106,7 @@ targets:
     expect:
       stdout:
         - contains: "version:"
-        - match: "\\d+\\.\\d+\\.\\d+"
+        - regex: "\\d+\\.\\d+\\.\\d+"
         - contains: "healthy"
 
   - id: "bun-stderr"
@@ -127,7 +129,8 @@ targets:
     db:
       url: "${sqlite_url}"
     expect:
-      maxDurationMs: 1000
+      durationMs:
+        lte: 1000
 
   - id: "sqlite-query"
     name: "SQLite 内存数据库多列结果校验"
@@ -145,6 +148,10 @@ targets:
             exists: true
           role:
             contains: "engineer"
+      result:
+        - json:
+            path: "$.rows[0].role"
+            equals: "engineer"
 
   # ========== TCP targets ==========
 
@@ -156,7 +163,8 @@ targets:
       host: "127.0.0.1"
       port: 6379
     expect:
-      maxDurationMs: 3000
+      durationMs:
+        lte: 3000
 
   - id: "smtp-banner"
     name: "SMTP Banner 探测"
@@ -169,7 +177,7 @@ targets:
       bannerReadTimeout: 3000
     expect:
       banner:
-        contains: "ESMTP"
+        - contains: "ESMTP"
 
   # ========== Ping targets ==========
 
@@ -183,10 +191,14 @@ targets:
       packetSize: 56
     expect:
       alive: true
-      maxPacketLoss: 10
-      maxAvgLatencyMs: 100
-      maxMaxLatencyMs: 300
-      maxDurationMs: 5000
+      packetLossPercent:
+        lte: 10
+      avgLatencyMs:
+        lte: 100
+      maxLatencyMs:
+        lte: 300
+      durationMs:
+        lte: 5000
 
   # ========== UDP targets ==========
 
@@ -201,7 +213,8 @@ targets:
     expect:
       response:
         - contains: "PONG"
-      maxDurationMs: 100
+      durationMs:
+        lte: 100
 
   - id: "udp-binary-probe"
     name: "UDP 二进制协议探测"
@@ -216,7 +229,8 @@ targets:
     expect:
       responseSize:
         gte: 4
-      maxDurationMs: 200
+      durationMs:
+        lte: 200
 
   - id: "udp-fire-and-forget"
     name: "UDP 发送验证（不等待响应）"
@@ -242,7 +256,8 @@ targets:
     expect:
       status:
         - 200
-      finishReason: "stop"
+      finishReason:
+        equals: "stop"
       output:
         - contains: "OK"
 
@@ -264,5 +279,7 @@ targets:
         completed: true
         firstTokenMs:
           lte: 5000
-      finishReason: "stop"
-      maxDurationMs: 15000
+      finishReason:
+        equals: "stop"
+      durationMs:
+        lte: 15000