fix: update TypeScript schema generator to use source/ directory

[misza-one]

Description

Updates generate_ts_schema_types.js to reference source/ instead of the removed spec/ directory. The spec/ directory was removed in #125, but this script was not updated — running it currently finds 0 schemas.

Single line change on line 5:

-const SOURCE_ROOT = path.resolve(__dirname, 'spec');
+const SOURCE_ROOT = path.resolve(__dirname, 'source');

Fixes #150

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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