chore(fast-usdc): update, test chain policies vs. spreadsheet

[dckc]

Description

Data from a requirements-gathering spreadsheet are turned into a test that shows that the MAINNET chain policies needed adjustment.

• chore(fast-usdc): update, test chain policies vs. spreadsheet
• feat(fast-usdc): update FeedPolicy along with Noble ICA
  • refactor(fast-usdc): export feedPolicies.MAINNET in vat code
  • docs(fast-usdc): FeedPolicy is no longer JSON serializable

Security Considerations

The values in a ChainPolicy express a balance of risk tolerance vs. speed etc.

agoric-sdk/packages/fast-usdc/src/types.ts

Line 114 in f83e5a9

export interface ChainPolicy {

Scaling Considerations

none

Documentation Considerations

• End users will likely only see a condensed version of these values ("ETA: 1 min").
• The values impact risks taken by liquidity providers.
• BLD stakers have an interested in the balance between speed and risk tolerance.
• for node operators: docs(fast-usdc): DON'T PANIC re "CORE_EVAL failed"

Testing Considerations

• test(boot): snapshot GTM Fast USDC feed policy
• test(a3p): fastUsdc.feedPolicy updated for GTM
  • test(a3p): gtm-fast-usdc

Upgrade Considerations

should be deployed as part of the fix for #11013

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