fix: gate Artic source role selection

[baskduf]

Summary

• Make Artic default reference roles conditional so Polaris/shadcn/Tailwind are not role-injected into unrelated editorial/static projects.
• Require role-grounded source candidates to pass catalog scoring, with avoid facets passed into search.
• Add regressions for editorial no-app/no-SaaS and Korean mobile React Native source selection, and sync Claude/Codex plugin mirrors.

Test Plan

• python3 -m pytest -q
• python3 -m compileall -q skills/artic/scripts plugins/claude-artic/skills/artic/scripts plugins/codex-artic/skills/artic/scripts
• git diff --check
• Independent reviewer pass: no blocking findings for findings 1/2 scope