fix(process): close review gaps from Codex round 1

- Mount LocalProcessManager in the sandbox e2e compositions (bwrap/landlock/
  seatbelt + the spine multi-project e2e) and add the spine demo's
  dsh-process-local devDependency, so SandboxBashExecutor's new inject
  resolves when those suites are enabled.
- Extend the Windows test/coverage skip to packages/process/* — the POSIX
  process-group suite moved there from packages/bash.
- Update the stale disposal contract: the bash seam JSDoc, BashProcess JSDoc,
  and core bash doc (en+zh) now state that composition teardown (the process
  manager's disposal) owns kill-and-await, and an executor-only reload leaves
  background processes running.
- Record ctx.processes in the architecture capability table and extension map
  (en+zh) and the root AGENTS.md layout tree; reword the timeout-library note
  so it describes where the plumbing and classification live today.

docs/architecture.md

@@ -28,6 +28,7 @@ Harnesses are [Cordis](cordis-primer.md) contexts with package-contributed servi
 | `ctx.llm` | [`llm/`](../packages/llm/README.md) | adapter registry and streaming model calls |
 | `ctx.tokenMeter` | [`llm/token-meter`](../packages/llm/token-meter/README.md) | singleton replay-aware request/surface pressure |
 | `ctx.bash` | [`bash/`](../packages/bash/README.md) | foreground/background command execution |
+| `ctx.processes` | [`process/`](../packages/process/README.md) | managed child-process groups under the bash executors |
 | `ctx.pty` | [`pty/`](../packages/pty/README.md) | owner-scoped persistent terminal sessions |
 | `ctx.sandbox` | [`sandbox/`](../packages/sandbox/README.md) | same-world process confinement (argv wrapping, per-call policy) |
 | `ctx.sandboxPolicy` | [`sandbox/`](../packages/sandbox/README.md) | shared sandbox policy home |
@@ -177,7 +178,7 @@ New behavior attaches to a documented extension point; a loop change updates thi
 |---|---|
 | Add a model provider | register an adapter on `ctx.llm` |
 | Add a model-facing capability | register on `ctx.tools`; schemas enter prompt assembly |
-| Add shell execution | implement and register a `ctx.bash` backend |
+| Add shell execution | implement and register a `ctx.bash` backend (the local one spawns through `ctx.processes`) |
 | Add persistent terminal execution | register a `ctx.pty` backend and `dsh-tool-pty` |
 | Add a human command | register on `ctx.commands`; adapters discover and dispatch it without a model turn |
 | Add background work | register on `ctx.tasks`; generic `task_*` tools collect or stop it |