Leo fu 599e25dfbf feat(command): add /history command to show recent session messages
Adds /history [n] to display the last N user/assistant messages from
the current session (default 10, max 50).

- Tool and system messages are filtered out for readability
- Long messages are truncated to 200 characters with an ellipsis
- Multimodal content (image blocks) is collapsed to its text parts
- Invalid count argument returns a usage hint
- /history n uses prefix routing; /history uses exact routing

Also registers /history in build_help_text().
2026-04-27 18:23:35 +08:00
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