docs: reserve seam for complete capabilities

docs/subsystems/spill.zh.md

@@ -2,13 +2,13 @@
 
 [English](spill.md) | 中文
 
-落盘存储 seam 是一项[能力 seam](../../.agents/notes/implemented/architecture/2026-07-08-tool-output-spill-files.md)，它持久保存工具的超大文本，并返回面向模型的定位符与检索指引；该能力拆分到三个包：接口（[dsh-spill](../../packages/spill/spill)，`ctx.spillStore`）、实现（[dsh-spill-local](../../packages/spill/spill-local)，宿主文件系统中会话作用域的私有文件）和消费方（[dsh-spill-policy](../../packages/spill/spill-policy)，`tools/post-execute` 策略）。落盘是**一项可选能力**，不属于 agent loop（智能体循环）主干，因此其词汇记录在此处，而不在 [core.md](core.md) 中。预览机制仍归 [dsh-retention](../../packages/util/retention) 所有；该 seam 只保存策略交给它的最终文本。
+落盘存储 seam 是一项[能力 seam](../../.agents/notes/implemented/architecture/2026-07-08-tool-output-spill-files.md)，它持久保存工具的超大文本，并返回面向模型的定位符与检索指引；该能力拆分到三个包：Service Definition（[dsh-spill](../../packages/spill/spill)，`ctx.spillStore`）、Service provider（[dsh-spill-local](../../packages/spill/spill-local)，宿主文件系统中会话作用域的私有文件）和 Consumer（[dsh-spill-policy](../../packages/spill/spill-policy)，`tools/post-execute` 策略）。落盘是**一项可选能力**，不属于 agent loop（智能体循环）主干，因此其词汇记录在此处，而不在 [core.md](core.md) 中。预览机制仍归 [dsh-retention](../../packages/util/retention) 所有；该 seam 只保存策略交给它的最终文本。
 
 源码：[`packages/spill/spill/src/types.ts`](../../packages/spill/spill/src/types.ts)
 
 ## 保存请求
 
-`saveText` 是整个 seam：原样持久保存 `content`，并返回不透明的定位符、后端提供的检索提示和准确字节数。请求携带保存时的存储命名空间（`owner`）、生成内容的工具和调用（`source`，用于命名和检查，而非访问控制）以及后端可用作命名提示的 `suggestedName`（它不是路径）。
+`saveText` 是唯一的服务操作：原样持久保存 `content`，并返回不透明的定位符、后端提供的检索提示和准确字节数。请求携带保存时的存储命名空间（`owner`）、生成内容的工具和调用（`source`，用于命名和检查，而非访问控制）以及后端可用作命名提示的 `suggestedName`（它不是路径）。
 
 ```ts type-equiv
 /** One request to persist text to a spill artifact. */
@@ -92,9 +92,9 @@ type SpillLocator = Branded<'SpillLocator'>
 
 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="ctxspillstore--spillstore"></a>
+<a id="ctxspillstore--spillstore-abstract-seam"></a>
 
-### `ctx.spillStore` — `SpillStore`
+### `ctx.spillStore` — `SpillStore` (abstract seam)
 
 Abstract spill storage service. Subclass, implement saveText, and load the subclass as a plugin — it registers as `ctx.spillStore` (one implementation per context; loading a second throws, cordis' standard duplicate-service behavior).