Add clamp function with schema and unit tests

[mck]

Implements a clamp function to constrain a value between minimum and maximum bounds. Includes TokenScript implementation, JSON schema definition, and comprehensive unit tests covering various edge cases and value types.

[Copilot]

Pull request overview

Introduces a general-purpose numeric clamp function with a TokenScript implementation, JSON schema, and unit tests to constrain values between minimum and maximum bounds.

Changes:

• Adds clamp.tokenscript implementing numeric clamping via TokenScript’s min/max primitives.
• Defines schema.json for the clamp function, including input/return types and illustrative examples.
• Adds unit.test.ts with Vitest coverage for schema presence and clamping behavior for integers, negatives, and floating-point values and boundaries.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/schemas/functions/clamp/clamp.tokenscript	Implements the clamp operation as min(max_val, max(min_val, value)) using TokenScript built-ins.
src/schemas/functions/clamp/schema.json	Declares the clamp function’s schema, metadata, input array (value, min, max), return type, and example usages.
src/schemas/functions/clamp/unit.test.ts	Verifies the function schema and runtime behavior across in-range, out-of-range, boundary, negative, and decimal inputs.

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