Extends the existing /undo command from a single in-memory exchange
removal into a full rewind: back up N user turns (default 1), soft-delete
the truncated rows in SessionDB (active=0, kept for audit, hidden from
re-prompts and search), notify memory providers, and prefill the composer
with the backed-up message text for editing — CLI and TUI.
Reuses the SessionDB rewind primitives, the on_session_switch(rewound=True)
memory hook, and the TUI command.dispatch prefill payload from SaguaroDev's
#21910 work, wired to /undo [N] instead of a separate /rewind picker.
- cli.py: undo_last(n, prefill) — in-memory truncate + SQLite soft-delete
+ agent surgery (system-prompt invalidate, flush-index reset) + memory
notify + editable buffer prefill; /undo dispatch parses optional count;
checkpoint-rollback caller passes prefill=False
- tui_gateway/server.py: command.dispatch undo branch (was rewind) parses
count, picks Nth-from-last user turn, clamps to oldest
- commands.py: /undo gains [N] args_hint
- tests: rename + expand TUI suite (multi-turn, clamp, invalid-count)
- release.py: AUTHOR_MAP entry for SaguaroDev
Co-authored-by: SaguaroDev <74339271+SaguaroDev@users.noreply.github.com>
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