Initial project setup with multi-component architecture

- Initialize TypeScript project with pnpm
- Create agent, gateway, client, and shared modules
- Configure ESM with strict TypeScript settings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/agent/agent.ts

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+export class Agent {
+  constructor(public readonly name: string) {}
+}

src/agent/index.ts

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+export * from "./agent.js";

src/client/client.ts

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+export class Client {
+  constructor(public readonly id: string) {}
+}

src/client/index.ts

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+export * from "./client.js";

src/gateway/gateway.ts

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+export class Gateway {
+  constructor(public readonly port: number) {}
+}

src/gateway/index.ts

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+export * from "./gateway.js";

src/index.ts

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+export * from "./agent/index.js";
+export * from "./gateway/index.js";
+export * from "./client/index.js";
+export * from "./shared/index.js";

src/shared/index.ts

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+export * from "./types.js";

src/shared/types.ts

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+export interface Message {
+  id: string;
+  payload: unknown;
+  timestamp: number;
+}