751a300fca
Live DM testing showed a reply to a DM cron brief did NOT continue the job. Root cause: for a 1:1 DM the governing knob is dm_top_level_threads_as_sessions (default True), NOT reply_in_thread / cron_continuable_surface. Under the default, each top-level DM keys to a per-message session (…:dm:<chat>:<ts>), so a reply mints a new ts and can never converge with the flat …:dm:<chat> session the cron seed creates. A 1:1 DM has no thread-vs-timeline split, so "in_channel" has no coherent meaning for a DM — cron_continuable_surface is a channel concept and is a no-op for DMs. DM continuation is governed entirely by dm_top_level_threads_as_sessions: - false → all top-level DMs share …:dm:<chat> → seed + reply converge → works - true (default) → per-message sessions → no continuation (cron or interactive) Option A (chosen): document the requirement; no code change (the flat-DM seed from the prior commit already lands correctly when the knob is false). Adds a ":::note 1:1 DMs" admonition to cron.md + the zh-Hans mirror. Verification (real inbound handler, not a hard-coded assumption — the mistake that made the earlier DM E2E falsely pass): tests/manual/cron_inchannel_dm_e2e.py drives the REAL _handle_slack_message for a top-level DM under both knob values and asserts false→converges (…:dm:D_TESTDM == seed), true→diverges (…:dm:D_TESTDM:<ts>). See decisions.md D9. |
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