Hetzner lib: replace all Python JSON parsing with jq. Uses the
/datacenters API as the authoritative source for server type
availability (server_types.available), cross-referenced with
/server_types for specs and pricing. jq is auto-installed if missing.
URLs: update openrouter.ai/lab/spawn → openrouter.ai/labs/spawn
across all READMEs and CLI source.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>