feat(commands): add /<N> defer-send + /0 cancel per chat#309
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`/<N> <message>` queues `<message>` to fire N minutes from now (default unit = minutes). The whole feature lives in the numeric `/<digits>` namespace so it can never collide with a word command: `/0` cancels the chat's pending deferred message — no ID needed. Per-chat single-slot rule: at most one pending deferred message per (bot, chat). A second `/<N>` while one is queued is rejected with the existing entry's details; `/status` surfaces the pending entry. Max defer is 7 days. Scheduler is injected via setter (process-singleton, mirrors setSessionRegistry); bots without one get a clear notice.
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This was referenced May 20, 2026
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Summary
/<N> <message>queues<message>to fire N minutes from now (default unit = minutes; independent of the live conversation)./<digits>namespace so it can never collide with a word command:/0cancels the chat's pending deferred message — no ID needed./<N>while one is queued is rejected with the existing entry's details;/statussurfaces the pending entry; max defer 7 days.setSessionRegistry); bots without one get a clear "scheduler unavailable" notice instead of crashing.Test plan
npm run build(tsc + web) — exit 0npm run lint— 0 errors (3 pre-existing warnings in untouched files)npx vitest run --dir tests/— all green (config-cluster failures areBOT_NAMEenv pollution from the test host, not this change)tests/command-handler-deferred.test.tscovers queue / single-slot //0cancel / no-task / trailing-body / missing-body / >7d / 7d boundary / no-scheduler //statustests/command-handler-help.test.tsasserts/0is documented