Introduces OrgConfig/OrgConfigSummary types, chrome.storage.local backing via org-config.ts, and the first org SW message (org_list_configs) wired in all three required places: PopupMessage union, POPUP_ONLY_TYPES set, and a case arm in popup-only.ts. Handler projects to OrgConfigSummary — apiToken, hostUrl, repoPath, memberId never leave the SW. 3 new TDD tests (RED→GREEN). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014s527M917W47LDrfQ4t47g