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.

packages/bash/bash/src/index.ts

@@ -43,7 +43,10 @@ declare module 'cordis' {
  *   failures settle as `killed` with the error on stderr.
  * - {@link BashProcess.readOutput} is incremental: consecutive reads never
  *   repeat output. Lossy reads report truncation and available spill files.
- * - Disposal kills all running background processes and awaits their exit.
+ * - A still-running background process is stopped and awaited when its
+ *   owning composition tears down. With the process-manager seam that
+ *   boundary is `ctx.processes` disposal, so a background process survives
+ *   an executor-only reload.
  */
 export abstract class BashExecutor extends Service {
   constructor(ctx: Context) {