gm

Reviewed overlay for SN28 gm. Public news/directory sources describe a TEE-enabled LLM inference marketplace. This pass added the missing website and source-repo surfaces (both already set as top-level website_url/source_repo fields, live-verified, but previously untracked as surfaces) and fixed all 4 surfaces having no probe config at all -- the registry-wide gap tracked in #5932. The 4 documented gm Gateway API paths (chat/completions, responses, messages, v1beta model actions) all require bearer auth per the OpenAPI schema's global security requirement and are write/inference-call endpoints, so none are promoted as additional surfaces. No dedicated docs subdomain found (docs.saygm.com unresolvable, saygm.com/docs 404s).