refactor(process): split the process manager out of the bash executor

New process/ capability family: @deepseek-ai/dsh-process owns ctx.processes —
abstract ProcessManager.spawn(spec) over a fully-explicit ProcessSpawnSpec —
plus the shared DSH_* managed-environment and CollectedOutput vocabulary;
@deepseek-ai/dsh-process-local carries the former bash-local run.ts plumbing
(detached groups, tail-keep spill-backed output, credential scrub, kill
escalation, kill-and-join disposal) with no config of its own.

dsh-bash-local becomes a consumer: it keeps command defaulting, the fused
deadline timedOut/aborted classification, the model-friendly terminal env
(now merged through the ordinary env channel), and the [stderr]-marked
background read merge, and spawns through ctx.processes. Background-process
lifetime moves to the manager, so an executor reload no longer kills live
background work; a background spawn failure is injected once into the read
path instead of being buffered as fake stderr. dsh-bash re-exports the moved
vocabulary so bash consumers keep one import root; dsh-bash-sandbox only
redeclares the inherited inject.

Every composition loading a bash executor now loads dsh-process-local (CLI,
examples, python bundled runtime, create-sdk bash feature, inline test
configs).

examples/cordis-agent/composition.md

@@ -12,6 +12,8 @@ flowchart LR
   cfg --> plugin_cordis_hmr
   plugin_cordis_llm_deepseek["llm-deepseek<br/>@deepseek-ai/dsh-llm-deepseek"]
   cfg --> plugin_cordis_llm_deepseek
+  plugin_cordis_processes["processes<br/>@deepseek-ai/dsh-process-local"]
+  cfg --> plugin_cordis_processes
   plugin_cordis_bash["bash<br/>@deepseek-ai/dsh-bash-local"]
   cfg --> plugin_cordis_bash
   plugin_cordis_fs_local["fs-local<br/>@deepseek-ai/dsh-fs-local"]
@@ -39,6 +41,7 @@ flowchart LR
 | --- | --- |
 | `hmr` | `@cordisjs/plugin-hmr` |
 | `llm-deepseek` | `@deepseek-ai/dsh-llm-deepseek` |
+| `processes` | `@deepseek-ai/dsh-process-local` |
 | `bash` | `@deepseek-ai/dsh-bash-local` |
 | `fs-local` | `@deepseek-ai/dsh-fs-local` |
 | `web` | `@deepseek-ai/dsh-web` |