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.

packages/bash/bash/src/index.ts

@@ -1,23 +1,7 @@
 /**
- * The bash executor seam (`ctx.bash`): an abstract service defining WHAT a
- * bash backend does — run foreground commands, start background processes —
- * without saying HOW. Implementations subclass {@link BashExecutor} and
- * register themselves as the `bash` service; `@deepseek-ai/dsh-bash-local`
- * (local subprocesses) is the first. Future implementations swap in
- * sandboxes, containers, or remote exec servers without touching the tool
- * schemas that consume them (`@deepseek-ai/dsh-tool-bash`).
- *
- * The split mirrors the LLM seam (`LlmService`/`LlmAdapter`) and the
- * surveyed agents: pi hides execution behind a `BashOperations` interface
- * (local shell / SSH / VM backends), Codex behind an exec-server protocol.
- *
- * The seam is deliberately TASK-FREE: `start()` hands back a
- * {@link BashProcess} handle (incremental reads, kill, a quiescence promise)
- * and nothing else. Task ids, owner isolation, polling tools, and completion
- * notices are the generic `ctx.tasks` runtime's job (`@deepseek-ai/dsh-tasks`)
- * — the tool layer adapts the handle into a task registration. This keeps a
- * remote/sandbox executor free of any session or registry dependency.
- *
+ * The `ctx.bash` executor seam for foreground commands and background process
+ * handles. Task ids, ownership, polling, and notices belong to
+ * `@deepseek-ai/dsh-tasks`, keeping executors independent of sessions.
  * @module @deepseek-ai/dsh-bash
  */
 
@@ -49,21 +33,15 @@ declare module 'cordis' {
  * implementation per context; loading a second throws, which is cordis'
  * standard duplicate-service behavior).
  *
- * Semantics every implementation must honor:
- * - {@link run} REJECTS only for infrastructure failures (unusable workdir,
- *   missing shell, pre-aborted signal). Nonzero exits, timeout kills, and
- *   abort kills RESOLVE with a descriptive {@link BashRunResult} — reporting
- *   a failed command is the tool layer's job, not an exception.
+ * Implementations must honor these semantics:
+ * - {@link run} rejects only for infrastructure failures. Nonzero exits,
+ *   timeout kills, and abort kills resolve with a {@link BashRunResult}.
  * - {@link start} returns immediately; no timeout applies to background
- *   processes (callers stop them via {@link BashProcess.kill} or the spec's
- *   AbortSignal). The handle's `done` settles at process close and never
- *   rejects (a spawn failure settles as `killed` with the error readable on
- *   stderr).
+ *   processes. `done` settles at process close and never rejects; spawn
+ *   failures settle as `killed` with the error on stderr.
  * - {@link BashProcess.readOutput} is incremental: consecutive reads never
- *   re-deliver output. Implementations bound their buffers; reads that lost
- *   data flag `lossy` and point at full-stream spill files when available.
- * - Disposal kills every running background process and awaits their exit
- *   (no orphan processes survive `fiber.dispose()`).
+ *   repeat output. Lossy reads report truncation and available spill files.
+ * - Disposal kills all running background processes and awaits their exit.
  */
 export abstract class BashExecutor extends Service {
   constructor(ctx: Context) {