🐛 fix(tsl_syntax): repair lookup engine and reconcile reference facts

lookup.py: exempt code-anchored ASCII identifiers from the mixed
zh/en gate so exact hits are no longer dropped; dedup parent/child
sections in results; validate write-prelude anchors in --check.

references: correct interpreter-verified facts (case-as-expression,
control-flow semicolons, __line__/__stack_frame, tslObjects order,
destroy timing, ErrDefine, truncated outputs), fix headings, scope
qualifiers and reversed quotes; strip dead preamble metadata from all
24 pages.

packaging: exclude __pycache__/*.pyc from playbook and bundle copies;
update build test file-count assertion to match.

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

skills/tsl-syntax-reference/references/06_expressions_and_operators.md

@@ -1,10 +1,5 @@
 # TSL 表达式与运算符
 
-文档类型：语法主线
-是否可直接用于生成代码：是
-是否含可直接照写示例：是
-是否含不可照写反例：是
-
 这一篇集中放语言级表达式与运算符。智能体写代码时，只使用本页和对应专题页已经明确的表达式事实，不要把其他语言或外部资料里的运算符习惯直接搬进 TSL。
 
 ## 本篇职责