feat(gateway): add discovered model catalog foundation

[cubeorgdev]

Summary

• add typed per-harness gateway model catalogs and capability negotiation
• add provisioner-side model discovery and durable catalog schema
• render gateway catalogs through versioned harness adapters
• document the contract and add compatibility classification tests

Verification

• cargo test -p gh-service
• cargo test -p gh-gateway-provisioner
• cargo test -p gh-config --lib
• cargo test -p control-api --lib

Follow-up

The admin resource handlers, full dashboard Models tab, and E2E coverage from the broader design remain follow-up work.

[cubeorgdev]

This pull request was created from a Blocks session.

View in dashboard | View on desktop