feat(conv): per-topic reply automation with promotion

[kmonsoe]

Stacked on #869 (→ #868 → #867 → #866 → #865). The design's "Automation" screen and promote dialog, with the backend under them.

Backend

• Migration 0085_conv_topic_automation — conv_topics.agent_mode varchar(16) (null = inherit) + auto_promoted_at timestamptz. Idempotent (ADD COLUMN IF NOT EXISTS), journal when strictly above 0084's; smoke-tested against a DB already at 0084 and re-run to prove idempotency.
• Effective mode — a topic's mode overrides the conversation's everywhere it is read: getConversation (what the runner acts on → promoting a topic flips its conversations to auto-send with no runtime change) and the queue DTO (agentMode resolved + raw topicAgentMode for the nudge line).
• ConvAutomationService — per-topic 30-day review record (approved-unedited / edited / rejected via the approvedDraft and draft_reply_rejected stamps from feat(conv): review-queue read model, internal notes, draft reject stamps #865, weekly volume, auto-sent) + org-wide 7-day auto-rate; setTopicAgentMode stamps auto_promoted_at on promotion (kept on re-promotion, cleared otherwise) and emits the new conversation.topic_automation_changed catalog event.
• Surface — GET /v1/conversations/automation, POST /v1/conversations/topics/:topicId/agent-mode; MCP tools conv_list_topic_automation (read) / conv_set_topic_automation (destructive, pre-checked 404 on unknown topic — no bare 500s); skill promote-topic-to-auto-send documenting the evidence → judgement → promote/demote loop. Docs fixtures + openapi regenerated (218 tools, 51 skills).

Dashboard

• pages/automation.tsx — header with the big 7-day auto-rate figure; per-topic table (volume/window, approved-unedited % with bar, cobalt at ≥90 %); actions per state: Auto-send on + one-click Back to manual, Promote to auto when the ≥90 % gate holds, or the hold note (needs ≥90% unedited / always human for off topics).
• Promote dialog — Review → Auto-send, unedited/edited/rejected percentage grid over the reviewed sample, "stepping back is one click" explanation, Not yet / Promote.
• Queue rows now read Topic · Auto/Review/Human (cobalt when effective mode is auto); Automation joins the Oversight nav group (admin-only). Full en + nb transcreation.

Tests

• conv-automation.service.test.ts: disposition math incl. 7-day auto-rate, promotion stamp kept on re-promotion / cleared on demotion, event emission ×4, 404 pre-check.
• conv.service.test.ts: topic mode overrides conversation mode in both detail and queue reads.
• Tool-naming suite green over the two new tools. backend-core conv+mcp: 66 passed in the touched files; dashboard-pages 96 passed; typecheck clean everywhere (types, backend-core, dashboard-pages, web).

🤖 Generated with Claude Code

https://claude.ai/code/session_01CPwvC1MqF1uhpNqC8BmvQN