v0.4.1 - Zod 4 Compatibility

What's Changed

• Added Zod 4 compatibility for extractZodShape() schema extraction
• Added isZodSchemaLike() and isZodRawShape() helpers for robust schema detection across Zod 3 and 4
• Accept raw shape objects ({ key: z.string() }) directly as tool parameters
• Fully backward compatible with Zod 3

Full Changelog: v0.4.0...v0.4.1