- Add shared discoverScopes function in auth.ts with resource metadata preference
- Update automatic flow (handleAuthError) to use dynamic scope discovery
- Update manual flow (OAuth state machine) to use shared scope discovery logic
- Add comprehensive test suite for discoverScopes function (11 test cases)
- Fix empty array handling to return undefined instead of empty string
- Maintain backward compatibility with existing oauthScope parameter
- All quality gates pass: TypeScript, linting, formatting, and tests
Resolves OAuth scope discovery inconsistency where automatic flow used static
scopes while manual flow used metadata scopes. Both flows now use identical
shared logic with proper resource metadata preference.
