Improve Test Coverage for New Schema Support

[Amanbig]

Description

With the latest RunAPI release adding schema support, the existing test suite does not fully cover the new functionality.

Currently:

• Some schema-related paths are untested
• Error cases (invalid schema, duplicate names, shadowing) lack coverage
• Auth and core routing logic still have limited edge-case tests

Improving test coverage would:

• Increase confidence in recent changes
• Prevent regressions as more features are added
• Make contributions safer and easier

Suggested Improvements

• Add unit tests for schema registration and resolution
• Add negative tests for invalid or conflicting schemas
• Add integration tests for schema + routing interaction
• Improve auth-related edge case tests

Expected Outcome

• Better reliability
• Clearer contributor confidence
• Higher code quality overall