Analyze and fix SonarCloud issues

[NTCoding]

Context

SonarCloud integration was added to CI. Before enforcing quality gates on new code, we should fix existing issues to establish a clean baseline.

Acceptance Criteria

• Query SonarCloud for all current issues on main branch
• Fix all CRITICAL and BLOCKER severity issues
• Fix all MAJOR severity issues
• Review and address any security hotspots
• Verify quality gate passes on the PR

Technical Notes

Query issues:

curl -s "https://sonarcloud.io/api/issues/search?projectKey=NTCoding_living-architecture&severities=CRITICAL,BLOCKER,MAJOR" | jq '.issues[] | {rule: .rule, message: .message, file: .component, line: .line}'

Query security hotspots:

curl -s "https://sonarcloud.io/api/hotspots/search?projectKey=NTCoding_living-architecture" | jq '.hotspots[] | {message: .message, file: .component, line: .line}'

Migrated from Task Master #69 (was in-progress)