Sessions

Session lifecycle operations are protocol-level Op variants (crates/protocol/src/protocol.rs) and are handled in core session handlers (crates/core/src/handlers/session.rs, crates/core/src/handlers/mode.rs).

Session Operations

Operation	Op	Core behavior	Primary event
Resume	`Op::ResumeSession`	Loads messages from persisted rollout and restores session source metadata.	`Event::SessionResumed`
Rewind (conversation only)	`Op::RewindTo`	Truncates messages to selected user turn; does not restore files.	`Event::RewindComplete`
Undo (conversation + files)	`Op::UndoTo`	Attempts persistence backtrack with file restore; falls back to message-only rewind on failure.	`Event::UndoToComplete`
Fork	`Op::ForkSession`	Truncates to selected turn, creates a new `SessionId`, and continues in new session lineage.	`Event::SessionForked`
New session	`Op::NewSession`	Resets in-memory state and emits fresh `SessionReady` + `AvailableSkills`.	`Event::SessionReady`
Rename	`Op::RenameSession`	Updates active session title.	`Event::SessionRenamed`

TUI Entry Points

From slash commands (crates/tui/src/app/update/commands.rs and crates/tui/src/app/update/modals.rs):

/resume opens resume picker and eventually sends Op::ResumeSession.
Double-Esc opens transcript picker in backtrack mode and sends Op::RewindTo.
/undo opens transcript picker in undo mode and sends Op::UndoTo.
/fork opens transcript picker in fork mode and sends Op::ForkSession.
/new resets UI state and sends Op::NewSession.
/rename opens rename modal and sends Op::RenameSession.

Export

/export and /export --json are TUI-side transcript exports (crates/tui/src/app/update/commands.rs):

reads rollout items
extracts message history
writes session-<id>.md or session-<id>.json in current working directory