4e199f93f7
Add Claude Code-compatible marketplace plugin infrastructure: - Registry: types, ID helpers, atomic read/write for marketplaces.json and installed_plugins.json (Claude Code format with version: 2) - Fetcher: classifySource (6 ordered rules), parseMarketplaceCatalog, fetchMarketplace (local sources; git/http stubs for Phase 2) - Resolver + Cache: resolvePluginSource with pathIsWithin containment, cachePlugin, removeCachedPlugin, cleanOrphanedCache - MarketplaceManager: orchestrates add/remove/update marketplaces, install/uninstall/enable plugins, clearPluginRootsCache on mutation - CLI: omp plugin marketplace add|remove|update|list, omp plugin discover, classifyInstallTarget for name@marketplace - Discovery: listClaudePluginRoots reads OMP registry alongside Claude's, OMP authoritative for duplicate plugin IDs - Args: --plugin-dir repeatable flag (parsing only, runtime wiring TBD) - Slash command: /reload-plugins clears fs + roots cache - Test fixtures and 130 tests across 8 test files