feat(S-201): Create src/types.ts with shared type definitions

tools/ai-cli-dispatch/src/types.ts

@@ -0,0 +1,36 @@
+export type ClientName = "codex" | "claude" | "opencode";
+
+export interface ClientInfo {
+  name: ClientName;
+  path?: string;
+  version?: string;
+  found: boolean;
+}
+
+export interface ExecResult {
+  stdout: string;
+  stderr: string;
+  exitCode: number;
+}
+
+export interface ToolConfig {
+  clients: ClientName[];
+  defaultClient?: ClientName;
+}
+
+export class ClientNotFoundError extends Error {
+  constructor(client: string) {
+    super(`Client "${client}" not found or not installed.`);
+    this.name = "ClientNotFoundError";
+  }
+}
+
+export class ExecError extends Error {
+  readonly result: ExecResult;
+
+  constructor(message: string, result: ExecResult) {
+    super(message);
+    this.name = "ExecError";
+    this.result = result;
+  }
+}