vbook-extensions

Create, fix, test, or refactor vBook extensions against the current engine API (extension-api.md + the real ScriptExecutor runtime) — novel/comic/video/tts/translate types, explore sections, richer detail/config schema. Tests, builds, and installs via the `scripts/vbook.js` CLI against the vBook local REST API. Trigger when the user wants a new extension built, an existing one fixed/updated, audited/tested for which script is failing, or refactored to the current template style, and mentions the vBook server / extension-api.md / newer script fields (explore, tags, format, track).