docs: reserve seam for complete capabilities

docs/subsystems/code-runtime.zh.md

@@ -2,7 +2,7 @@
 
 [English](code-runtime.md) | 中文
 
-代码执行 seam 是一个[能力 seam](../../.agents/notes/implemented/architecture/2026-06-13-capability-seams.md)：其接口（[dsh-code-runtime](../../packages/code-runtime/code-runtime)，`ctx.codeRuntime`）使用宿主提供的异步绑定运行一段模型编写的程序，并报告其打印内容与返回值。代码执行是**一项可选能力**，不属于 agent loop（智能体循环）主干，因此其词汇定义在此而非 [core.md](core.md) 中。各后端的执行基底与源语言不同，这两项均为服务上的只读描述符；worker-thread 后端与工具注册表消费方的约定见 [Code Mode 基础设计](../../.agents/notes/implemented/feature/2026-06-15-code-mode.md) 和[类型化返回约定](../../.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.md)。
+代码执行 seam 是一个[能力 seam](../../.agents/notes/implemented/architecture/2026-06-13-capability-seams.md)：其 Service Definition（[dsh-code-runtime](../../packages/code-runtime/code-runtime)，`ctx.codeRuntime`）使用宿主提供的异步绑定运行一段模型编写的程序，并报告其打印内容与返回值。代码执行是**一项可选能力**，不属于 agent loop（智能体循环）主干，因此其词汇定义在此而非 [core.md](core.md) 中。各后端的执行基底与源语言不同，这两项均为服务上的只读描述符；worker-thread Service provider 与工具注册表 Consumer 的约定见 [Code Mode 基础设计](../../.agents/notes/implemented/feature/2026-06-15-code-mode.md) 和[类型化返回约定](../../.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.md)。
 
 源码：[`packages/code-runtime/code-runtime/src/types.ts`](../../packages/code-runtime/code-runtime/src/types.ts)
 
@@ -112,7 +112,7 @@ interface CodeBindingNamespace {
 ```
 
 ```ts type-equiv
-/** A lossless JSON value transferable across the dependency-light code-runtime seam. */
+/** A lossless JSON value transferable through the dependency-light Service Definition. */
 type CodeJsonValue = null | boolean | number | string | CodeJsonValue[] | { [key: string]: CodeJsonValue }
 ```
 
@@ -168,17 +168,17 @@ interface CodeRunFailure {
 
 Generated from source by `scripts/gen-cordis-catalog.ts` (verified fresh by `pnpm run verify-cordis-catalog` in doc-sync; regenerate with `pnpm run gen-cordis-catalog`) — this section is byte-identical in both language sides of the page. Signature blocks use a `ts cordis-catalog` fence and keep the original source JSDoc; dispatch modes are defined in the [primer](../cordis-primer.md#dispatch-modes), and the framework-inherited `ctx` surface lives in [cordis-api/inherited.md](../cordis-api/inherited.md).
 
-<a id="ctxcoderuntime--coderuntime"></a>
+<a id="ctxcoderuntime--coderuntime-abstract-seam"></a>
 
-### `ctx.codeRuntime` — `CodeRuntime`
+### `ctx.codeRuntime` — `CodeRuntime` (abstract seam)
 
-Registers one `ctx.codeRuntime` implementation. Program, budget, abort, and substrate failures resolve in CodeRunResult; only seam misuse rejects. Implementations bridge structured-cloneable bindings, materialize each declared namespace rejection class, treat programs as hostile peers, isolate runs from one another, and terminate and await in-flight runs during disposal.
+Registers one `ctx.codeRuntime` implementation. Program, budget, abort, and substrate failures resolve in CodeRunResult; only Service Definition contract misuse rejects. Implementations bridge structured-cloneable bindings, materialize each declared namespace rejection class, treat programs as hostile peers, isolate runs from one another, and terminate and await in-flight runs during disposal.
 
 ```ts cordis-catalog
 /**
  * Execute one program against the request's bindings and capture what it
  * emitted. See the class doc for the resolution contract (error is a result
- * field; rejection means seam misuse only).
+ * field; rejection means Service Definition contract misuse only).
  * @param request - the program, its bindings, and the abort signal; the
  *   request carries everything the runtime acts on, with no hidden defaults.
  * @returns the run's outcome: completion value (when transferable), the