- Add AgentSkillEntry type with skillId, source, installedAt fields
- install() now sends agentId in body not agentSkillsDir
- uninstall() new function that sends agentId as query param
- rollback() now sends agentId in body not agentSkillsDir
- skillGroups.assignGroup/removeGroup no longer accept agentSkillsDir param
- listAgentSkills now returns AgentSkillEntry[] not string[]
- Fix AgentDetail.tsx callers and entry rendering for new AgentSkillEntry type
- Fix SkillDetail.tsx callers to use agentId param
- Create ui/src/api/skillGroups.ts with skillGroupsApi object
- All 14 methods covering group CRUD, members, export/import, agent assignments
- removeGroup uses raw fetch for DELETE-with-body (api.delete has no body support)
- Add skillGroups namespace to ui/src/lib/queryKeys.ts with 6 key factories
