feat(web): W4-A wire console to real endpoints

- Agent page uses contracts (AgentRun/AgentRunDetail/AgentGoalReport) instead of a local
  mirror; ?mock=1 stays as an explicit demo switch; run snapshot refreshes on agent.run_status;
  stream auto-follow only while the user stays near the bottom (abort stays reachable)
- settings: Pi provider select incl. fake, new Agent runtime card (budgets, fakeScript)
- download trace uses /tasks?subjectId= and /organization-records?downloadTaskId= instead of
  time-window engine run matching and path matching; new business-task tab with cancel/retry
- workbench download dialog posts /acquisition-plans and shows per-slot rejection reasons
- preference tag revision history; subscription search by title/kind; identity/alias/subscription
  lists show entity titles; slot cards show current asset summary; policy preview sample titles
- DecisionSummary / IdentityRevisionList / ReleaseIdentityResult / TaskAccepted / PolicyPreviewSummary /
  OrganizePlanArtifactContent taken from contracts
- docs: SSE for console (cookie) vs GET /events?after=&limit= JSON replay for API keys

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/agent/agent-conversation.tsx

@@ -372,6 +372,9 @@ export function FinalReport({
 }
 
 /** 会话流:用户目标 → 流式文本/工具卡片/拒绝/压缩 → 结束 */
+/** 末尾标记离视口底部不超过这么多像素算"停在底部" */
+const FOLLOW_SLACK_PX = 160;
+
 export function AgentConversation({
   run,
   live,
@@ -386,9 +389,20 @@ export function AgentConversation({
   const endRef = useRef<HTMLDivElement>(null);
   const active = isRunActive(run.status) && !live.finished;
   const count = live.items.length;
+  // 有新内容时跟随到底,但只在用户停在底部附近时跟随:往上翻(去点"中止"、看早先的工具卡)后不再把视口拽回去,
+  // 翻回底部附近自动恢复。捕获阶段监听 scroll,侧栏抽屉里的滚动容器也算。
+  const stick = useRef(true);
+  useEffect(() => {
+    const onScroll = () => {
+      const el = endRef.current;
+      if (el) stick.current = el.getBoundingClientRect().top - window.innerHeight < FOLLOW_SLACK_PX;
+    };
+    document.addEventListener("scroll", onScroll, { capture: true, passive: true });
+    return () => document.removeEventListener("scroll", onScroll, { capture: true });
+  }, []);
   // biome-ignore lint/correctness/useExhaustiveDependencies: 有新内容时滚到底
   useEffect(() => {
-    if (active) endRef.current?.scrollIntoView({ block: "nearest" });
+    if (active && stick.current) endRef.current?.scrollIntoView({ block: "nearest" });
   }, [count, active]);
 
   // 追加的用户消息按时间插入