test(fast-usdc): 8 contract tests passing

  8 tests passed
  4 tests skipped
  1 test todo
Done in 3.50s

 - use oracle, customer in advance happy path
   - factor out makeOracleOperator
 - registerAsset() from the test jig doesn't work:
   brands in the contract are in a different "address space"
 - use realistic USDC denom
 - shared context for contract tests
   - customer sends before LPs deposit
   - racer tests
 - flatten makeLP
   - don't mix with pourPayment
   - derive publicFacet etc. from instance as client would