docs(readme): add simplified chinese version

docs(bot): document review and cancel commands

feat(bot): wire review and cancel commands

feat(bot): add cancel command

feat(bot): add review command

feat(core): model review and cancelled tasks

feat(codex): add abort-aware cli execution

feat(core): add cancellable channel queue

docs(plans): add review and cancel implementation plan

docs(plans): add review and cancel design

docs(bot): document slash command surface

feat(bot): register discord command surface

feat(bot): add skill and mcp discovery commands

feat(bot): add status command

feat(bot): add slash run command