Summary

• Refactored RoleClaimsTransformation.AddRolesFromClaim by extracting dedicated helpers for JSON parsing and delimited parsing to meet the cognitive complexity target defined in issue Refactor: Reduce Cognitive Complexity in AddRolesFromClaim #595.
• Documented the new helpers with XML comments and preserved existing behavior, including the invalid JSON fallback path, in line with the project's contribution guidance.
• Added focused unit coverage in RoleClaimsTransformationTests for JSON arrays, comma-separated strings, and malformed payloads so future changes remain safe.

Implementation Notes

• JSON detection now relies on StringComparison.Ordinal to avoid culture-related surprises and mirrors other security components.
• TryAddJsonArrayRoles returns false on any parsing failure to maintain the prior "best effort" semantics before falling back to string-based parsing.
• The infrastructure test project now references FlowSynx directly so tests exercise the same class registered in production.

Testing

• Attempted dotnet test tests/FlowSynx.Infrastructure.UnitTests/FlowSynx.Infrastructure.UnitTests.csproj --no-build (fails: dotnet CLI not available in execution environment)

Closes #595