Coldint

Reviewed overlay for SN29 using the official Coldint website, validator repository, dynamic configuration repository, README documentation, and referenced training dataset. This pass fixed the min-compute data-artifact surface (added by a recent contributor PR) having no probe config at all -- the registry-wide gap tracked in #5932 -- and removed an incorrect social.x value (https://x.com/cacheon_ai, a copy-paste of SN14 Cacheon's own handle, unrelated to this subnet); no official Coldint social account was found on the website or in the README to replace it with. On-chain SubnetIdentitiesV3 native_name is a stylized "hotfloat" rather than "Coldint", but the on-chain website_url field matches coldint.io exactly, positively confirming the same operator -- not treated as a rename.