precious state of Inter Protocol features in Vaults release is reachably durable

[turadg]

Acceptance criteria

Every contract in Inter Protocol is audited for precious state and it's determined to be reachably durable

This does not require that protocol be upgradable.

[Chris-Hibbert]

Complement of #4511.

[dckc]

@ivanlei For reference, the following are the 22 vats created at bootstrap in pismoA:

"vats": {
    "v1": "bootstrap",
    "v2": "vatAdmin",
    "v3": "comms",
    "v4": "vattp",
    "v5": "timer",
    "v6": "zoe",
    "v7": "board",
    "v8": "chainStorage",
    "v9": "centralSupply",
    "v10": "mintHolder: USDC_axl",
    "v11": "mintHolder: AUSD",
    "v12": "psmCharter",
    "v13": "committee.econ",
    "v14": "mintHolder: BLD",
    "v15": "bank",
    "v16": "walletFactory",
    "v17": "governor: PSM(USDC_axl)",
    "v18": "governor: PSM(AUSD)",
    "v19": "governor: ?",
    "v20": "PSM(USDC_axl)",
    "v21": "PSM(AUSD)",
    "v22": "provisionPool"
},

https://github.com/agoric-labs/vatviz-g8/blob/06c844b3d71eaf04452776442d50ee49ac7b85c0/www/index.html#L31-L54

[turadg]

Closing because all the items in the epic are done:

• vaultFactory reachably durable was done but not closed
• BLD Boost isn't necessary for Vaults release so I removed it and clarified the scope of this epic

Remaining durability and upgrade requirements for release are tracked through milestones.