Add discovery contract bridge for 0.3.2

[kev1n]

Summary

• add an isolated dual-contract discovery adapter for the current and replacement gateway payloads
• switch anyapi search to the dedicated /catalog/search endpoint
• expose only AnyAPI-branded nested USD pricing to CLI commands and bundled skills
• release the compatibility bridge as 0.3.2

Why

The gateway discovery contract is moving atomically from internal credit fields to discriminated USD offers. This bridge must ship first so installed CLI users continue to work before, during, and after the server cutover.

Validation

• npm run build
• npm test (44 tests)
• npm pack --dry-run
• git diff --check

Rollout

Tag and publish v0.3.2 after merge. The follow-up 0.3.3 release removes the temporary legacy reader after the replacement gateway is deployed and canaried.