Root cause: installer called 'openclaw gateway restart' (async via systemd)
then immediately validated model visibility — race condition caused validation
to fail and rollback the correct config.
Fix: remove restart + validation from script entirely. Script only writes config.
User restarts gateway manually after install completes.
Also fix CONFIG.example.json: contextWindow 4096->200000, maxTokens 64->8192
(OpenClaw requires minimum 16000 contextWindow).
