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* feat(slack): enable DM support with per-thread IDs and implicit mentions DMs now use per-message threadTs (same as channels) instead of collapsing all DM messages into one thread. Each top-level DM starts a new conversation; thread replies continue the same conversation. DM messages automatically set isMention=true so bots process them without requiring @mention — natural for 1:1 conversations. * fix: use empty threadTs for top-level DMs, thread_ts for replies Top-level DM messages use empty threadTs to match openDM() subscriptions. DM thread replies use thread_ts for per-conversation isolation. Fixes integration test replay-dm.test.ts. * style: fix biome formatting * test: add e2e replay tests for direct DM implicit mention * style: fix extra blank line lint error * test: use real recorded DM fixtures for e2e tests