feat: implement comprehensive test fixtures using type builder

[Copilot]

This PR completely rewrites the test fixtures in src/__tests__/fixtures.ts to use the type builder (t) instead of the schema builder (s), providing realistic schemas that cover all JSON Type node types.

Changes Made

Replaced old schema-based fixtures with type-based realistic schemas:

• User profile schema - Demonstrates nested objects and optional fields using t.object() and .opt()
• Product catalog - Shows arrays, formatted numbers, and optional properties
• Blog post - Illustrates timestamps, enums, and cross-references
• API response - Features discriminated unions for success/error states
• File metadata - Includes binary data handling
• Configuration - Demonstrates maps and environment-specific settings
• Event data - Uses tuples for coordinates and complex metadata
• Contact info - Shows arrays of tuples and formatted strings
• Database records - Illustrates audit fields and references
• Function types - Covers both regular and streaming functions
• Complex nested structures - Deep nesting with maps and unions

Node Type Coverage

All JSON Type node types are now represented:

• any - Flexible data fields
• const - Literal values and enums
• boolean - Feature flags and status indicators
• number - Various formats (u16, u32, u64, f64) with constraints
• string - ASCII format with length validation
• binary - File data with type information
• array - Collections with size constraints
• tuple - Fixed-length structured data
• object - Complex nested structures
• map - Dynamic key-value collections
• union/or - Discriminated unions and flexible types
• ref - Cross-schema references
• function - Validation and processing functions
• streaming function - Real-time data streams

Backward Compatibility

Maintains compatibility with existing tests by providing the original primitiveSchemas, compositeSchemas, allSchemas, and schemaCategories exports that convert the new type-based fixtures to schemas using .getSchema().

The new fixtures provide more realistic and comprehensive examples while ensuring all tests continue to pass without modification.

Fixes #44.

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[streamich]

Leave existing schemas defined with s as-is. Only add new schemas with t, do not modify existing ones.

[streamich]

Revert changes to existing schemas with s, leave them as they were before.

[github-actions]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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