v0.3.4 — the Claude Code plugin actually loads

Fixed

• The Claude Code plugin never loaded. plugin.json declared
  "hooks": "./hooks/hooks.json", but Claude Code loads that path by convention, so the
  manifest registered it a second time and the whole plugin failed with "Duplicate hooks
  file detected". /plugin install reported success; only the /plugin error tab showed
  it. Broken since the plugin was written and shipped in every release, because nothing in
  the suite read the manifests. test/plugin-manifest.test.js now validates both of them:
  no re-declaration of conventional paths, every referenced directory and hook script
  exists, the marketplace entry resolves to the plugin, and the versions track
  package.json.