Expose nested context.usage.metadata and context.usage.insights so rule logic reads naturally and metrics are clearly scoped. Expand the in-editor type docs and starter examples to make the API easier to discover and use.

…ction arguments

- Deprecate parameterized `classify(usage)` and `enforcement(usage)`
- Make user-facing rule functions argument-free
- Inject `usage` explicitly into `runtime.usage` inside V8 sandbox
- Expose `runtime` in TypeScript declarations with `usage` typing
- Add JSDoc hover documentation for metrics in Monaco editor
- Switch ambiguous fields to explicit `focusScore`, `productiveMinutes`, and `distractingMinutes`
- Replace plain `<pre>` docs snippets with read-only Monaco `<CodeBlock>` for rich highlighting and hover support
- Update internal backend tests and starter template to match new API