Show provider subagents in the subagents track (#2013)

* Add provider-owned subagent stream contract

* OpenCode provider: detect child sessions, attach adopted children to the hosting server, synthesize external turns

- Emit internal provider_child_session_detected / provider_session_deleted stream events from the global event stream (before the no-active-turn gate), including BFS hydration of existing descendants on subscribe
- Track child sessions in a registry mapping child session id -> hosting server url; resumeSession attaches via acquireExisting() so adopted children share the parent's server generation and keep receiving live events
- Synthesize external turns for adopted (externally driven) sessions so timeline, tool calls, and permission requests stream without a Paseo-initiated prompt
- Honor launchContext.env in resumeSession (acquireDedicated parity with createSession)
- Stop folding child tool parts into the parent's sub_agent action log; the parent row stays as a pointer

* Render provider subagents in workspace timelines

* fix provider subagent timeline reliability

* fix provider subagent lifecycle edge cases

* fix provider subagent event fidelity

* Fix provider subagent history fidelity

* Fix restored provider subagent state

* Fix provider subagent visibility edges

* Restore provider subagent timelines

* Page provider subagent history

* Forward subagent questions reliably

* fix(subagents): preserve OpenCode child context

* fix(subagents): harden provider timeline routing

* fix(subagents): preserve provider page continuity

* fix(subagents): retain live child prompts

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Co-authored-by: Omer <639682+omercnet@users.noreply.github.com>

packages/app/src/subagents/track-presentation.ts

@@ -1,6 +1,12 @@
 import type { SidebarStateBucket } from "@/utils/sidebar-agent-state";
 import { deriveSidebarStateBucket } from "@/utils/sidebar-agent-state";
 import type { SubagentRow } from "./select";
+import { providerSubagentLifecycleStatus } from "./provider-store";
+
+function presentationStatus(row: SubagentRow) {
+  if (row.kind === "paseo") return row.status;
+  return providerSubagentLifecycleStatus(row.status);
+}
 
 export interface SubagentRowPresentationData {
   key: string;
@@ -13,14 +19,15 @@ export interface SubagentRowPresentationData {
 
 export function buildSubagentRowPresentationData(row: SubagentRow): SubagentRowPresentationData {
   const label = resolveRowLabel(row.title);
+  const status = presentationStatus(row);
   return {
-    key: `subagent_${row.id}`,
+    key: `${row.kind}_subagent_${row.id}`,
     kind: "agent",
     label: label ?? "",
     subtitle: "",
     titleState: label ? "ready" : "loading",
     statusBucket: deriveSidebarStateBucket({
-      status: row.status,
+      status,
       requiresAttention: false,
     }),
   };