- skill-registry-adapter-install.test.ts: 9 tests covering install/uninstall/rollback/assignGroup/removeGroup
- hermes-dual-source.test.ts: 7 tests covering syncHermesNativeSkills idempotency and listAgentSkills object shape
- Fix skill-registry-install.test.ts: update uninstall() callers to pass agentSkillsDir (new required param)
- Fix removeGroup() bug: removed incorrect 'individualSkills' guard that prevented file removal for group-installed skills
(rule 1 auto-fix: group-installed skills were never removed because they appeared in agentSkills with no way to distinguish from direct installs)
- All 16 new tests pass, all existing tests still pass
