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02203fb834
Fill the stage-3 Replier=nil tail so non-installer Slack users can onboard and get status feedback — completing B2 end to end. - slack.OutboundReplier (engine.OutboundReplier): on NeedsBinding it mints a single-use binding token and DMs/replies a "link your account" prompt with the redeem URL (wrapped as <url|label> so formatMrkdwn doesn't mangle the base64url token); on AgentOffline/AgentArchived it posts a status notice; on an /issue-created Ingest it confirms the new issue. Plain chat stays silent (the agent's own reply lands via EventChatDone). Reuses the bot-token Send path and reads the installation row from ResolvedInstallation.Platform — no new transport. - slack.BindingTokenService: Mint + transactional RedeemAndBind over the generic channel_binding_token / channel_user_binding queries (channel_type='slack'), mirroring lark.BindingTokenService. 15-min TTL, SHA256-hashed tokens, the three typed failure modes (invalid/expired, already-assigned, not-member). - HTTP: POST /api/slack/binding/redeem (public, session-authed) maps the failures to 410/409/403. NewSlackResolverSet now takes the replier (nil disables it). - Frontend: /slack/bind redeem page (packages/views/slack + apps/web route) + api.redeemSlackBindingToken + en/zh slack_bind copy. Verified: go build ./..., go vet, gofmt, go test ./internal/integrations/... (new replier_test.go covers all outcome branches + the prompt URL), plus full pnpm typecheck (6/6) and pnpm lint (0 errors). Co-authored-by: multica-agent <github@multica.ai>