chore: synchronize development into dev - #26
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删除了contrib下的vortex文件，因和indicators目录下功能完全重复，会导致重复导入覆盖
cci指标在平盘是会出现除0异常
…bool_ 导致抛 TypeError: __bool__ should return bool
在exactbars>0时，lineroot.py:624 与 :610：return bool(value != 0.0)，返回 np.…
…29）。 读 line[-N] 需要 _minperiod >= N+1，否则 QBuffer 回绕到当前尚未写入的槽位，静默返回 NaN 或错值，不报错
LineBuffer.qbuffer 设 maxlen = max(1, self._minperiod)（linebuffer.py:3…
fix: restore undefined CCI semantics on flat prices
chore(governance): promote Iteration 140 rollout
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问题与动机
按维护者指令，将已在
development集成并验证的改进与修复同步到日常开发分支dev。当前提交关系：
development比dev多 17 个提交，dev没有独有提交，因此这是无冲突、可快进的同步。目标分支与原因
devdevelopment的已验证内容同步回日常开发分支；不涉及master。风险级别
lineroot/lineiterator/LineBuffer的语义修复和指标实现，需完整跨平台 CI 验证。兼容性影响
不引入新的公共 API；将
development中既有的 CCI、OBV、QBuffer 与 NumPy bool 修复及回归测试带入dev。master保持不变。执行过的命令与结果
gh api repos/cloudQuant/backtrader/compare/dev...development：developmentahead 17，devahead 0。git diff --check 90a3f180..b52b3f7e：通过。b52b3f7e的 GitHub 完整跨平台 CI：通过。关联 Issue
维护者指令同步；覆盖既有 PR #19、#20、#21、#22、#24 和 #25 的已集成内容。