docs: clarify start runs an independent process, add optional service…

[Noah-Bytes]

… setup

Noah reported that closing the CLI/agent session that launched codex-openmax start doesn't stop the adapter — the docs never explained that start is its own process, not a child tied to the invoking session's lifetime.

Adds: an explicit note on that behavior + how to stop it, and an optional "running as a persistent service" section (systemd user service / pm2) for anyone who wants it to survive a reboot. Marked optional and requiring the user's explicit go-ahead first — it changes system state (a boot-persistent service), unlike the default init/start flow.

What

Why

Test plan

• npm test passes locally
• npm run build passes locally

Checklist

• No secrets / credentials committed
• Semgrep / Gitleaks findings addressed, or a // nosemgrep: <rule-id> suppression is justified inline and approved by the project lead

[gavin09527]

LGTM — docs-only + alpha.3 bump, approving.

The 'start is an independent process / survives closing the session' note is the right thing to document (matches Noah's observation) and correctly tells you how to stop it (Ctrl+C / kill PID). The optional systemd/pm2 section is appropriately gated — 'ask the user before setting it up; don't do it silently' aligns with treating a boot-persistent service as an explicit, state-changing action; the unit/pm2 commands are sound and the 'run init once beforehand' note is correct. No secrets, no code changes.

One minor non-blocking doc-accuracy nuance: elsewhere the docs describe start as running 'in the foreground until SIGINT/SIGTERM', which is in slight tension with 'keeps running after you close the terminal'. A plain interactive foreground process usually gets SIGHUP'd and dies when its terminal closes; the survive-the-session behavior is specific to agent/CLI harnesses that launch it in a way that doesn't propagate SIGHUP (or detach it). Might be worth a half-sentence clarifying it's launch-context-dependent, so a user who ran it in a bare terminal and saw it stop on close isn't confused. Not blocking.

[gavin09527]

LGTM ✅ 文案与我先前的建议一致（start 取决于启动方式；补充可选的 service 说明）。已正式 approve。

[gavin09527]

重新审过 10104d1（address zylos0t P3s）——WorkingDirectory=%h/.codex-openmax、enable-linger 标注为系统级变更需先征得用户同意、可读性调整都到位 ✅。此次为最新一次 push（Noah-Bytes 16:08）后的批准，满足 require_last_push_approval。