feat: fix stream and structured on stream

[maticzav]

No description provided.

[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to 1cd2157.

Security Overview

• 🔎 Scanned files: 4 changed file(s)

Detected Code Changes

Change Type	Relevant files
Enhancement	► examples/stream-zod.ts     Added new streaming example with Zod schema validation ► examples/stream.ts     Simplified stream implementation ► src/resources/tasks.ts     Updated stream method with type support and schema handling ► examples/zod.ts     Renamed from structured-output.ts

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