feat(quick-260327-x64): add skill sync types and resolution utilities to adapter-utils
- Add AdapterSkillSyncMode, AdapterSkillState, AdapterSkillOrigin, AdapterSkillEntry, AdapterSkillSnapshot, AdapterSkillContext types to types.ts
- Add optional listSkills/syncSkills methods to ServerAdapterModule interface
- Export new skill types from index.ts
- Add skill resolution helpers to server-utils.ts: resolveAgentCompanySkillsDir, listAgentCompanySkillEntries, readInstalledSkillTargets, buildPersistentSkillSnapshot, readAgentCompanyRuntimeSkillEntries, readAgentCompanySkillSyncPreference, resolveAgentCompanyDesiredSkillNames, writeAgentCompanySkillSyncPreference, ensureAgentCompanySkillSymlink, removeMaintainerOnlySkillSymlinks