- Added /todo export and /todo import commands to write/read markdown todos, defaulting to TODO.md.
- Changed /todo append from JSON payloads to tokenized [<phase>] <task...> input with quoted tokens.
- Changed /todo start/done/drop/rm matching to fuzzy-resolve task or phase names in TodoCommandController.
- Removed /todo replace from todo-command builtins in CHANGELOG and command registry.
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