refactor: remove terminal agent concept entirely

Remove the "agent can be a terminal" branching from the entire codebase.
An agent is now always a session-backed chat agent. Standalone terminal
infrastructure (terminal component, ANSI handling, terminal-stream-protocol)
is preserved.

Server: delete ManagedTerminalAgent, AgentKind, TerminalExitDetails,
launchTerminalAgent, registerTerminalAgent, handleTerminalAgentExited,
supportsTerminalMode capability, buildTerminalCreate/ResumeCommand from
all providers, terminal agent persistence/projections.

App: delete terminal-agent-panel.tsx, terminal-agent-reopen-store.ts,
terminal/terminalExit fields on agent state, "Terminal Agents" launcher
section, terminal-agent workspace setup flow, terminal badge in agent list.

CLI: remove terminal column from ls, terminal-agent error from send.

60 files changed, -3592 lines

packages/app/src/utils/workspace-navigation.test.ts

@@ -23,10 +23,6 @@ vi.mock("@react-native-async-storage/async-storage", () => {
 });
 
 import { useWorkspaceLayoutStore } from "@/stores/workspace-layout-store";
-import {
-  buildTerminalAgentReopenKey,
-  useTerminalAgentReopenStore,
-} from "@/stores/terminal-agent-reopen-store";
 import { prepareWorkspaceTab } from "@/utils/workspace-navigation";
 
 const SERVER_ID = "server-1";
@@ -40,39 +36,17 @@ describe("prepareWorkspaceTab", () => {
       splitSizesByWorkspace: {},
       pinnedAgentIdsByWorkspace: {},
     });
-    useTerminalAgentReopenStore.setState({
-      reopenIntentVersionByAgentKey: {},
-      requestReopen: useTerminalAgentReopenStore.getState().requestReopen,
-    });
   });
 
-  it("publishes a reopen intent when requested for an agent tab", () => {
+  it("opens and focuses an agent tab", () => {
     const route = prepareWorkspaceTab({
       serverId: SERVER_ID,
       workspaceId: WORKSPACE_ID,
       target: { kind: "agent", agentId: AGENT_ID },
-      requestReopen: true,
     });
 
-    const reopenKey = buildTerminalAgentReopenKey({ serverId: SERVER_ID, agentId: AGENT_ID });
-    expect(reopenKey).toBeTruthy();
     expect(route).toBe("/h/server-1/workspace/L3JlcG8vd29ya3RyZWU");
-    expect(
-      useTerminalAgentReopenStore.getState().reopenIntentVersionByAgentKey[reopenKey as string],
-    ).toBe(1);
-  });
-
-  it("does not publish a reopen intent unless explicitly requested", () => {
-    prepareWorkspaceTab({
-      serverId: SERVER_ID,
-      workspaceId: WORKSPACE_ID,
-      target: { kind: "agent", agentId: AGENT_ID },
-    });
-
-    const reopenKey = buildTerminalAgentReopenKey({ serverId: SERVER_ID, agentId: AGENT_ID });
-    expect(reopenKey).toBeTruthy();
-    expect(
-      useTerminalAgentReopenStore.getState().reopenIntentVersionByAgentKey[reopenKey as string],
-    ).toBeUndefined();
+    const key = "server-1:/repo/worktree";
+    expect(useWorkspaceLayoutStore.getState().getWorkspaceTabs(key)).toHaveLength(1);
   });
 });