Module tree 

Branches inside one conversation (/branch, /tree).

Session::messages stays the active path: the transcript shown and sent to the model. Every other path is a Branch, a full root-to-leaf copy, so compaction, spill and undo on the active path never reach it. The tree is rebuilt on demand by merging paths whose turns match.

Turns match by a fingerprint that leaves out tool-result bodies, because pruning and spilling shorten those in place on the active path. A path whose prefix was compacted into a summary no longer matches its siblings and shows as its own line from the root.

Structs

Branch

A stored path other than the active one.

TreeRow

One user turn in the tree, in display order.

TreeTarget

A node to switch to: the first end messages of one path.

Enums

BranchError

Why a branch command could not run.