Add migration assessment artifacts and remove temporary assessment context#19

Copilot wants to merge 3 commits into

app-modernize-20260521033712qianwens/PhotoAlbum-Java:app-modernize-20260521033712from

copilot/run-core-assessment-one-more-timeqianwens/PhotoAlbum-Java:copilot/run-core-assessment-one-more-timeCopy head branch name to clipboard