Add Structured Output Methods

[maticzav]

This PR creates SDK structured output methods.

[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to 84476f1.

Security Overview

• 🔎 Scanned files: 9 changed file(s)

Detected Code Changes

Change Type	Relevant files
Configuration changes	► .gitignore     Add .env to ignored files ► .nvmrc     Set Node version to v22.12.0 ► package.json     Add zod dependency
Enhancement	► examples/demo.ts     Add demo implementation ► examples/structured-output.ts     Add structured output example ► examples/utils.ts     Add spinner utility ► src/lib/parse.ts     Add structured output parsing ► src/resources/tasks.ts     Add structured output support to Tasks API

Reply to this PR with @delve-auditor followed by a description of what change you want and we'll auto-submit a change to this PR to implement it.