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[ThomasHumper]

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Fix schema generation script and improve Zod + runtime compatibility

Summary

This PR fixes several runtime and type issues in the schema generation script and improves compatibility between Node.js, Zod, and JSON schema output generation.

Changes

• Fix __dirname usage in ESM by replacing it with fileURLToPath(import.meta.url)
• Replace invalid z.url() with z.string().url()
• Replace unsupported z.toJSONSchema with zod-to-json-schema
• Fix incorrect use of Bun.argv → replaced with process.argv
• Remove invalid .describe() usage on discriminated union branch object
• Improve typing of dynamic schema variable (z.ZodTypeAny)
• Fix unsafe enum construction for EntityTagEnum
• Clean up schema definitions for consistency and correctness
• Improve CLI error handling and messages
• Standardize JSON schema output generation

Impact

• Script now runs correctly in Node ESM environments
• Schema generation is stable and deterministic
• Fixes runtime crashes caused by missing or invalid Zod APIs
• Improves maintainability of metadata/resource schema system

Notes

This change aligns the project with standard Zod + Node.js ESM usage patterns and removes reliance on non-standard APIs.

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