vendor-listing

Onboard a vendor who wants their API listed in the treg catalog. Use whenever someone asks "how do we get listed on treg", a vendor sends their API details, or a listing PR/issue needs review. Walks the whole pipeline: eligibility gate → registry entry → platform-key slot → logo → tests → LIVE bogus-key test → core catalog YAML → verify → scrub → validate → evidence ledger in the PR. Every listing ships tier-4…