docs: name Node's proxy opt-in in LIMITS and THREAT-MODEL

[PrzemekGalarowicz]

Summary

• Update LIMITS.md §3a to document Node's opt-in proxy support (NODE_USE_ENV_PROXY / --use-env-proxy) and which Node versions lack it.
• Align the matching bullets in THREAT-MODEL.md so the named regression matches the limit (opt-in restores proxying; commands report which case applies before fetch).

Test plan

• npm run lint:md → 0 issues
• Skim §3a + the two threat-model bullets against docs/troubleshooting.md → "Proxy environment variables"

Made with Cursor

[coderabbitai]

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