website: fix nine review findings (generator coverage, loader facts, mode semantics)

Generator (all four structural gaps):
- harness service pages now render public properties/accessors, not just
  methods (ctx.codeRuntime.language/isolation were missing);
- the class page merges the same-named interface half, so ctx.root/baseUrl/
  events/logger/reflect/registry appear on Context (vendor root JSDoc gains
  prose alongside @experimental);
- Pick<…> heritage on a Context merge resolves to the picked class members,
  giving ctx.effect a documented signature on the Fiber page;
- {@link} tags normalize to code spans; merge sections get their own h2 so
  reflect members no longer nest under 'Static members'.

verify-website-yaml: reject the unloadable 'group:' pseudo-name (tree.import
only special-cases 'cordis:'; no builtin is registered here) and recurse into
@cordisjs/plugin-group nested entry lists instead.

Prose corrected against loader/cordis source: service.md isolation example
uses the real group plugin + group: true + the required isolate map;
config.md documents concurrent entry startup (Promise.all; order via inject)
and the real hmr defaults (root ['.'], base/ignored/debounce); events.md
fixes emit (synchronous, not parallel), bail (null/false also delegate), and
serial (stops at the first bail value).

website/zh-CN/api/cordis/context.md

@@ -57,6 +57,66 @@ Plugins loaded under the returned context see `config` merged into the service's
 
 [Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L139)
 
+### ctx.root
+
+```ts website-api
+root: this
+```
+
+The root context of the application (every child context shares it). @experimental
+
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L22)
+
+### ctx.baseUrl
+
+```ts website-api
+baseUrl?: string
+```
+
+Base URL used to resolve relative plugin/module specifiers, if the runtime sets one.
+
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L24)
+
+### ctx.events
+
+```ts website-api
+events: EventsService
+```
+
+The event bus. Its methods are also mixed onto `ctx` (`ctx.on`, `ctx.emit`, ...).
+
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L26)
+
+### ctx.logger
+
+```ts website-api
+logger: LoggerService
+```
+
+The logging service. Call `ctx.logger(name)` for a named logger.
+
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L28)
+
+### ctx.reflect
+
+```ts website-api
+reflect: ReflectService
+```
+
+The reflection layer backing the context proxy (`ctx.get`, `ctx.provide`, ...).
+
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L30)
+
+### ctx.registry
+
+```ts website-api
+registry: RegistryService
+```
+
+The plugin registry. Its methods are mixed onto `ctx` (`ctx.plugin`, `ctx.inject`).
+
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L32)
+
 ## Static members
 
 ### Context.effect
@@ -114,6 +174,8 @@ Works across realms and across multiple copies of cordis, because the brand is k
 
 [Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/vendor/cordis/src/context.ts#L61)
 
+## Service store and mixins
+
 ### ctx.get(name, strict?)
 
 ```ts website-api