🐛 fix(tsl-syntax-reference): check fence language per block identity

- `--check` now requires `反例 / 不可照写` in a text fence and
  `可直接照写示例` in a tsl fence; the AGENTS.md flow that extracts every
  ```tsl block and runs it would otherwise execute a counterexample as if
  it were a valid example, and an example hidden in a text fence would
  never be extracted for verification
- 10 held the only counterexample in a tsl fence (a local function call
  with a trailing `with array(...)`); the rule and that fix cannot land in
  separate commits or --check fails in between
- 配置片段 / 概念骨架 and 仅服务端可执行示例 stay unconstrained, since both
  languages are in use for them today

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

skills/tsl-syntax-reference/references/10_runtime_context_and_with.md

@@ -420,7 +420,7 @@ end;
 
 代码块身份：反例 / 不可照写
 
-```tsl
+```text
 cached_result := Demo() with array("a": 11);
 
 function Demo();

skills/tsl-syntax-reference/scripts/lookup.py

@@ -35,6 +35,13 @@ ALLOWED_IDENTITIES = {
     "配置片段 / 概念骨架",
     "仅服务端可执行示例",
 }
+# 身份与围栏语言的固定对应。反例必须留在 text 围栏：批量抽取 ```tsl 块实跑的
+# 流程会把 tsl 围栏里的反例当正例执行；反过来照写示例落进 text 围栏就永远不会
+# 被抽出来验证。其余身份（概念骨架、仅服务端示例）按页面需要自行选择语言。
+IDENTITY_FENCE_LANGUAGES = {
+    "反例 / 不可照写": "text",
+    "可直接照写示例": "tsl",
+}
 ROUTER_PHRASES = ("路由中心", "选择一个主专题", "候选页继续判断")
 EXCLUDED_REFERENCE_FILES = {"index.md"}
 DUTY_HEADING = "本篇职责"
@@ -411,16 +418,30 @@ def _identity_problems(page: Path, lines: list[str]) -> list[ValidationProblem]:
                 problems.append(ValidationProblem(page, index, f"未知身份：{identity}"))
     in_fence = False
     for index, line in enumerate(lines):
-        if FENCE_RE.match(line):
+        fence = FENCE_RE.match(line)
+        if fence:
             if in_fence:
                 in_fence = False
             else:
-                if _associated_identity(lines, index) is None:
+                identity = _associated_identity(lines, index)
+                if identity is None:
                     problems.append(
                         ValidationProblem(
                             page, index + 1, "每个代码围栏必须关联恰好一个代码块身份"
                         )
                     )
+                else:
+                    expected = IDENTITY_FENCE_LANGUAGES.get(identity)
+                    language = (fence.group(1) or "").strip()
+                    if expected is not None and language != expected:
+                        problems.append(
+                            ValidationProblem(
+                                page,
+                                index + 1,
+                                f"「{identity}」必须写在 ```{expected} 围栏里，"
+                                f"当前是 ```{language or '（无语言标注）'}",
+                            )
+                        )
                 in_fence = True
             continue
         if not in_fence and SUSPICIOUS_FENCE_RE.match(line):