feat: add chainName, status, primeBlockProof to interchain trace types

- InterchainTransaction: add chainName + status (pending|confirmed|dropped).
- VerificationBlock: add primeBlockProof (now exposed by prime-node after the
  JSON tag fix) so clients can reconstruct the signed message and verify the
  validator signature.

src/types.ts

@@ -149,6 +149,12 @@ export interface VerificationBlock {
   version: string;
   primeChainId: string;
   primeBlockId: string;
+  /**
+   * The prime block's proof this validator block attests to. Part of the signed
+   * message (blake2b-256 over version|primeChainId|primeBlockId|primeBlockProof|
+   * timestamp|verifierPublicKey), so it is required to verify verifierSignature.
+   */
+  primeBlockProof: string;
   timestamp: string;
   verifierPublicKey: string;
   verifierSignature: string;
@@ -163,9 +169,15 @@ export interface InterchainTransaction {
   id: number;
   version: string;
   timestamp: string;
+  /** Numeric external network id ("1"=ETH, "0"=BTC, ...). May be absent for chains without one. */
   chainId: string;
+  /** Explicit external chain name ("ETH", "BTC", "BASE", "BNB") — authoritative. */
+  chainName: string;
   transHash: string;
+  /** External chain block the anchor confirmed in; empty until confirmed (see status). */
   blockId: string;
+  /** Confirmation state: "pending" | "confirmed" | "dropped". */
+  status: string;
   validatorBlocks: string[];
   validatorBlockhash: string;
   signature: string;