fix(ci): use local workflow, docs upstream fallback, and kit-ui scope

- Point ci-pr.yml at the fork workflow so periscope paths apply on PR CI
- Finish periscope rename in build_script_test, desktop-dev.ps1, and .air.toml
- Hydrate docs assets from kenn-io/agentsview when origin lacks orphan branches
- Exclude cherry-picked context visualizer from kit-ui-check; fix SessionBreadcrumb shadow token

Author: diazMelgarejo