Document the Linux procps-compatible ps prerequisite before quick start and in the installation/provider guides. Scope it to shared process-supervision workflows and give recovery guidance for generic provider startup errors.
Actual JavaScript CLI analysis passed with ps and refused an empty PATH with capability_unavailable and retained partial evidence. Real Chrome scenario launch succeeded without ps, confirming the need for qualified wording. Docs checks, formatting, typecheck/lint and diff checks passed. Five English documentation files; no runtime changes. Native Ghidra/JADX/firmware execution was not performed.
Fixes#2763
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