• Merge pull request #537 from kaitranntt/feat/506-composite-provider-variant
• chore(merge): resolve dev conflicts for pr 537
• test(cliproxy): stabilize path-sensitive CI test assertions
• chore(metrics): refresh maintainability baseline
• test(cliproxy): add regression coverage for update consistency
• fix(cliproxy): keep variant updates atomic and persisted
• fix(cliproxy): harden composite validation and runtime safeguards
• chore(merge): resolve conflicts with origin/dev
• fix(cliproxy): harden composite variant routing and validation
• fix(cliproxy): fix thinking off regression and composite error handling
• fix(cliproxy): fix edit dialog empty model and composite guidance
• fix(cliproxy): address 3 code review issues in composite variants
• fix(cliproxy): address 4 functional regressions in composite variants
• fix(cliproxy): restore POST tier validation and guard null payloads
• fix(cliproxy): address 3 functional regressions in composite variants