Initial AuthModule, ApiGateway, and DatabaseLayer stubs.

README.md

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+# Halite sample service
+
+Tiny TypeScript-style tree used to demo Halite decision invalidation.
+
+Watched paths:
+- `src/auth/auth.service.ts` (AuthModule)
+- `src/api/gateway.ts` (ApiGateway)
+- `src/db/postgres.ts` (DatabaseLayer)

src/api/gateway.ts

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+export class ApiGateway {
+  /** API routing gateway — auth checks and rate limiting live here. */
+  route(path: string): string {
+    return `/internal${path}`;
+  }
+}

src/auth/auth.service.ts

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+export class AuthModule {
+  /** JWT authentication service — matches Halite component path. */
+  validateAccessToken(token: string): boolean {
+    if (!token) return false;
+    const parts = token.split(".");
+    return parts.length === 3;
+  }
+}

src/db/postgres.ts

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+export class DatabaseLayer {
+  /** PostgreSQL connection pool owned by DatabaseLayer. */
+  async query(_sql: string): Promise<unknown[]> {
+    return [];
+  }
+}