docs(tasks): condense background task prose

The background-task change repeated its lifecycle design across implemented RFCs, package READMEs, JSDoc, test commentary, and model-visible schemas. That repetition obscured the contracts that maintainers must preserve and added avoidable prompt tokens.

Rewrite the implemented RFCs around the current design, keep authorization, exact-owner cleanup, wait/abort ordering, producer quiescence, and teardown-failure guarantees at their owning surfaces, and remove peer surveys, review history, control-flow narration, and emphatic restatement.

Shorten the task and subagent schema wording, synchronize the bilingual tool cookbook, and regenerate the config, service, RFC, tool, and replay snapshot derivatives. Runtime behavior is unchanged; test edits update prose-only assertions and descriptions.

docs/config-catalog.md

@@ -154,7 +154,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/bash/bash-local/src/index.ts:27`](../packages/bash/bash-local/src/index.ts)
+Source: [`packages/bash/bash-local/src/index.ts:17`](../packages/bash/bash-local/src/index.ts)
 
 ## `@deepseek-ai/dsh-bash-sandbox`
 
@@ -165,7 +165,7 @@ Requires: `sandbox`
  * Plugin config: the local executor's knobs plus the sandbox policy. All
  * optional — `static Config` supplies the defaults (`mode: 'read-only'` is the
  * fail-safe default; an example that wants a workspace-writable agent opts in
- * explicitly). The runner choice is NOT configured here: which platform
+ * explicitly). The runner choice is not configured here: which platform
  * backend confines the command is the `ctx.sandbox` provider's config.
  */
 export interface Config extends LocalConfig {
@@ -886,19 +886,14 @@ Source: [`packages/context/time-context/src/index.ts:22`](../packages/context/ti
 Requires: `tools` · `bash` · `systemPrompt`
 
 ```ts config-catalog
-/** Config: whether the model may background commands (the producer-opt-in flag). */
+/** Configures whether the model may background commands. */
 export interface Config {
-  /**
-   * Expose `run_in_background` in the bash schema (default true). Disabled,
-   * the parameter is absent entirely — schema and capability never disagree.
-   * Backgrounding also needs the `ctx.tasks` runtime at call time; a missing
-   * one fails the call loud with the load-these-packages message.
-   */
+  /** Expose `run_in_background` (default true); disabled calls are also rejected. */
   enableRunInBackground?: boolean
 }
 ```
 
-Source: [`packages/bash/tool-bash/src/index.ts:48`](../packages/bash/tool-bash/src/index.ts)
+Source: [`packages/bash/tool-bash/src/index.ts:30`](../packages/bash/tool-bash/src/index.ts)
 
 ## `@deepseek-ai/dsh-tool-cordis`
 
@@ -962,42 +957,29 @@ export interface Config {
   /** The `ctx.subagents` provider name to start runs on (e.g. `spawn`, `acp`). */
   provider: string
   /**
-   * The model-facing tool name to register (default `subagent`). To expose more
-   * than one transport, load this plugin once per provider — each load MUST set
-   * a distinct `toolName` (the tool registry rejects a duplicate name), e.g.
-   * `{ provider: 'spawn', toolName: 'subagent' }` and
-   * `{ provider: 'acp', toolName: 'subagent_acp' }`.
+   * Model-facing tool name (default `subagent`). Each loaded instance must use
+   * a distinct name.
    */
   toolName?: string
   /**
-   * Expose `run_in_background` in this instance's schema (default true).
-   * Disabled, the parameter is absent entirely — schema and capability never
-   * disagree; delegation through this instance stays strictly synchronous.
-   * Backgrounding also needs the `ctx.tasks` runtime at call time; a missing
-   * one fails the call loud with the load-these-packages message.
+   * Expose `run_in_background` (default true). Disabled instances omit the
+   * parameter and reject forced background calls.
    */
   enableRunInBackground?: boolean
   /**
-   * Default per-child agent options (model) applied to every spawned child.
-   * Omitted fields fall back to the child loop's own defaults.
+   * Agent options applied to every child; omitted fields use child-loop defaults.
    */
   agentOptions?: AgentOptions
   /**
-   * Per-child persona applied to every child this tool spawns: a scoped
-   * `deployment:persona` section shadowing the deployment's persona for the
-   * child alone. Requires the bound provider's `persona` capability
-   * (in-process backends support it; a request against one that doesn't is
-   * rejected at start). Omitted ⇒ the child renders the deployment persona.
+   * Per-child persona that shadows `deployment:persona`. Requires the
+   * provider's `persona` capability; omission preserves the deployment persona.
    */
   persona?: string
   /**
-   * Tool scoping applied to every child this tool spawns (see
-   * `SubagentStartRequest.toolFilter`): the named global tools vanish from
-   * the child's prompt AND refuse to execute. Requires the provider's
-   * `toolFilter` capability. Unknown names fail the spawn loudly. Note the
-   * child otherwise sees every global tool — including this delegation tool
-   * itself; `deny`-listing it (or setting `maxDepth`) is how a deployment
-   * bounds recursion.
+   * Tool filter applied to every child. Filtered tools disappear from its
+   * prompt and reject execution. Requires the provider's `toolFilter`
+   * capability; unknown names fail startup. Children otherwise see this tool,
+   * so deny it or set `maxDepth` to bound recursion.
    */
   toolFilter?: {
     /** Global tool names the child keeps; everything else is removed. */
@@ -1006,12 +988,8 @@ export interface Config {
     deny?: string[]
   }
   /**
-   * Recursion cap applied to every child this tool spawns (see
-   * `SubagentStartRequest.maxDepth`): a spawn whose child would sit deeper
-   * than this in the delegation tree is rejected. Requires the provider's
-   * `depthLimit` capability. Must be a non-negative safe integer and is
-   * validated when the plugin loads. Omitted ⇒ unbounded (bound it in
-   * deployments that expose this tool to children).
+   * Maximum child depth. Requires the provider's `depthLimit` capability and a
+   * non-negative safe integer. Omission is unbounded.
    */
   maxDepth?: number
 }
@@ -1019,14 +997,14 @@ export interface Config {
 
 Depends on: [`AgentOptions`](../packages/core/agent/src/index.ts)
 
-Source: [`packages/subagent/tool-subagent/src/index.ts:59`](../packages/subagent/tool-subagent/src/index.ts)
+Source: [`packages/subagent/tool-subagent/src/index.ts:23`](../packages/subagent/tool-subagent/src/index.ts)
 
 ## `@deepseek-ai/dsh-tool-tasks`
 
 Requires: `tools` · `tasks` · `systemPrompt`
 
 ```ts config-catalog
-/** Config: the `task_output` wait bounds (defaulted, capped — never hardcoded). */
+/** Configures bounded `task_output` waits. */
 export interface Config {
   /** Wait duration applied when `task_output` sets `wait` without `timeout_ms` (default 30s). */
   waitTimeoutMs?: number
@@ -1035,7 +1013,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/tasks/tool-tasks/src/index.ts:34`](../packages/tasks/tool-tasks/src/index.ts)
+Source: [`packages/tasks/tool-tasks/src/index.ts:21`](../packages/tasks/tool-tasks/src/index.ts)
 
 ## `@deepseek-ai/dsh-tool-web`