feat(acp): Implemented the structured terminal lifecycle for ACP.

-   Modified `packages/core/src/tools/shell.ts` to always include `exitCode` and `signal` in `ToolResult.data`.
-   Modified `packages/cli/src/acp/acpClient.ts` to send `_meta.terminal_info` on start, `_meta.terminal_output` during streaming (deltas), and `_meta.terminal_exit` on completion.
-   Added verification tests in `packages/cli/src/acp/acpClient.test.ts`

packages/core/src/tools/shell.ts

@@ -452,12 +452,15 @@ export class ShellToolInvocation extends BaseToolInvocation<
 
         if (result.exitCode !== null && result.exitCode !== 0) {
           llmContentParts.push(`Exit Code: ${result.exitCode}`);
-          data = {
-            exitCode: result.exitCode,
-            isError: true,
-          };
         }
 
+        data = {
+          exitCode: result.exitCode,
+          signal: result.signal,
+          isError: result.exitCode !== 0 || !!result.error || !!result.signal,
+          pid: result.pid,
+        };
+
         if (result.signal) {
           llmContentParts.push(`Signal: ${result.signal}`);
         }