fix(gen): define 位宽/整数提升/移位/AugAssign 规则收敛，修 va_list 与 traceback 卡死

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- define 位宽：cdefine_decl_bits 单一裁决（注解 → 右侧强转 → 值最小可存宽度），定义方与 VpiReader 两处跨模块注册共用；lookup_cdefine_bits 取最后一条非零记录；存储即截断；使用侧改按声明位宽；通用求值器加编译期除零/移位越界 fail-fast
- 消除对无符号强转加宽方向的依赖：define_min_width 改 (value>>32)==0，截断改左移+算术右移，修 TPC/TPV 判定不一致导致 0x80000000 误判 64 位
- 整数提升：算术/移位、比较、一元 +/-/~ 提升到 i32；位运算保持同宽不提升
- AugAssign：y 有效宽度须 <= x、禁 y 显式有符号而 x 无符号；移位计数静态范围检查
- 函数入口复位 va_list 状态与 willFree 失效槽表（FuncGenDef/FuncGenMixin/VarGenMixin 等）
- BuildPipeline：traceback 逐行扫描改 span 判定，去掉对全文 strlen 的 O(n^2)

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TermiNexus committed 2026-10-12 12:37:48 +08:00

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App/lib/Stub/StubGen/VpiReader.vp

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