Clean up ctl file design#18

Merged

congwang-mk merged 7 commits intomainfrom

Feb 10, 2026

Commits on Feb 10, 2026

Add parallel sibling branches with first-wins conflict detection
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Use explicit branch names in root ctl and CLI commit/abort
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Clean up ctl file design: root ctl for switch only, per-branch ctl for commit/abort
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Consolidate current-branch tracking into BranchManager
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Remove string parameters from branch ioctls, derive context from ctl fd inode
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Remove nested @parent/@child virtual dirs, use flat namespace only
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Fix cargo fmt
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