feat(validation): implement framework-independent SDK response schema…

[Code-Paragon]

Description

Implements a lightweight, framework-independent SDK response schema guard system to verify unknown runtime API payloads before exposing them as typed public data.

• Created composable schema builders (string, number, boolean, nullType, literal, optional, array, object, union).
• Implemented strongly typed parsing returning discriminated ValidationResult<T> objects.
• Added structured path tracking (e.g., data.members[2].id) for descriptive validation failures.
• Enforced strict recursion depth bounding (max depth 20) to protect against pathological payloads and stack overflows.
• Backed by 89 comprehensive unit tests covering primitives, nested objects, arrays, unions, and malformed responses.

Closes #451.

Type of Change

• Bug fix (fix(scope): message)
• New feature (feat(scope): message)
• Documentation (docs(scope): message)
• Refactoring (refactor(scope): message)
• CI/CD (ci(scope): message)
• Other

PR Title Format

This PR follows Conventional Commits:

Testing

• Tests pass locally (pnpm test / pnpm typecheck / pnpm build)
• New tests added (if applicable)

Checklist

• PR title follows type(scope): message format
• Code follows project style guidelines
• Self-review completed

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[Lakes41]

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