Bundled plugins

Drop a <name>/plugin.{ts,tsx} here that default-exports a HermesPlugin and it registers automatically at boot (vite glob in ../contrib/plugins.ts), with the same inventory + live enable/disable contract as runtime plugins.

None ship in-tree today — reference/demo plugins (the counter example, the gateway-pill 1:1 rebuild, the runtime-loader hello world) live in the companion hermes-example-plugins repo so the shipped app stays uncluttered.

User- and agent-authored plugins load at runtime from $HERMES_HOME/desktop-plugins/<name>/plugin.js (the disk door) — see the hermes-desktop-plugins skill.