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/stores/provider-recency-store.ts

@@ -92,7 +92,7 @@ export const useProviderRecencyStore = create<ProviderRecencyStoreState>()(
       },
     }),
     {
-      name: "terminal-agent-provider-recency",
+      name: "agent-provider-recency",
       version: PROVIDER_RECENCY_STORE_VERSION,
       storage: createJSONStorage(() => AsyncStorage),
       partialize: (state) => ({

packages/app/src/stores/session-store.ts

@@ -80,13 +80,10 @@ export interface AgentRuntimeInfo {
   extra?: Record<string, unknown>;
 }
 
-type TerminalExitDetails = NonNullable<AgentSnapshotPayload["terminalExit"]>;
-
 export interface Agent {
   serverId: string;
   id: string;
   provider: AgentProvider;
-  terminal: boolean;
   status: AgentLifecycleStatus;
   createdAt: Date;
   updatedAt: Date;
@@ -100,7 +97,6 @@ export interface Agent {
   runtimeInfo?: AgentRuntimeInfo;
   lastUsage?: AgentUsage;
   lastError?: string | null;
-  terminalExit?: TerminalExitDetails | null;
   title: string | null;
   cwd: string;
   model: string | null;
@@ -1127,7 +1123,6 @@ export const useSessionStore = create<SessionStore>()(
             id: agent.id,
             serverId,
             title: agent.title ?? null,
-            terminal: agent.terminal,
             status: agent.status,
             lastActivityAt,
             cwd: agent.cwd,

packages/app/src/stores/terminal-agent-reopen-store.ts

@@ -1,52 +0,0 @@
-import { create } from "zustand";
-
-interface BuildTerminalAgentReopenKeyInput {
-  serverId: string;
-  agentId: string;
-}
-
-interface RequestTerminalAgentReopenInput {
-  serverId: string;
-  agentId: string;
-}
-
-interface TerminalAgentReopenStore {
-  reopenIntentVersionByAgentKey: Record<string, number>;
-  requestReopen: (input: RequestTerminalAgentReopenInput) => void;
-}
-
-function trimNonEmpty(value: string | null | undefined): string | null {
-  if (typeof value !== "string") {
-    return null;
-  }
-  const trimmed = value.trim();
-  return trimmed.length > 0 ? trimmed : null;
-}
-
-export function buildTerminalAgentReopenKey(
-  input: BuildTerminalAgentReopenKeyInput,
-): string | null {
-  const serverId = trimNonEmpty(input.serverId);
-  const agentId = trimNonEmpty(input.agentId);
-  if (!serverId || !agentId) {
-    return null;
-  }
-  return `${serverId}:${agentId}`;
-}
-
-export const useTerminalAgentReopenStore = create<TerminalAgentReopenStore>()((set) => ({
-  reopenIntentVersionByAgentKey: {},
-  requestReopen: ({ serverId, agentId }) => {
-    const key = buildTerminalAgentReopenKey({ serverId, agentId });
-    if (!key) {
-      return;
-    }
-
-    set((state) => ({
-      reopenIntentVersionByAgentKey: {
-        ...state.reopenIntentVersionByAgentKey,
-        [key]: (state.reopenIntentVersionByAgentKey[key] ?? 0) + 1,
-      },
-    }));
-  },
-}));