Build the public page with the three solvency figures

[luchobonatti]

User story / Problem statement

The vault exposes three figures that make coverage legible without inference: committed_assets, escrowed_assets and cancellable_escrow. Nothing renders them. A holder deciding whether to request a redemption has no way to see whether the reserve can cover what is already committed.

Expected outcome

A public page, no wallet required, showing coverage as it stands.

Acceptance criteria

• the three figures, plus the vault's asset balance, read live from chain
• the solvency relation shown as it is enforced: reserve ≥ committed + cancellable_escrow
• the last attested NAV with its date and age, labelled as attested rather than measured
• feed health shown: Valid, Stale or Paused
• the proof reference from the latest attestation, linked
• the accepted risks stated in plain language: the treasury has to fund the next settlement and nothing on chain forces it; a colluding treasury and attester defeat the separation; the attested value is the single point of failure for every price
• no wallet connection required to read any of it

Technical notes

A "committed but unfunded" figure cannot exist by construction: an unfundable strike reverts instead of booking. Do not invent one, and do not compute a coverage ratio that implies a guarantee the contract does not make.

The page has to say what the figures do not create. They make coverage legible; they do not make the treasury fund the next settlement.