Fix script validation failures: PlutusV2→V3 and missing CBOR encoding in zero.ts and distribute.ts

[Copilot]

Aiken compiles validators to PlutusV3, but zero.ts and distribute.ts were wrapping script bytes as PlutusV2 and skipping the required applySingleCborEncoding step — causing script validation failure at the wrong language version with malformed script bytes.

Changes

• src/zero.ts and src/distribute.ts: PlutusV2 → PlutusV3 throughout (createScript + createBlackholeAddress)
• src/zero.ts and src/distribute.ts: Wrap applyParamsToScript with applySingleCborEncoding — applyParamsToScript returns double-CBOR-encoded bytes; PlutusV3 requires single-CBOR-encoded bytes

// Before
const scriptHex = UPLC.applyParamsToScript(plutus, [...]);
return new PlutusV2({ bytes: hexToBytes(scriptHex) });

// After
const scriptHex = UPLC.applySingleCborEncoding(
  UPLC.applyParamsToScript(plutus, [...])
);
return new PlutusV3({ bytes: hexToBytes(scriptHex) });

Also removes the erroneously added redeemer: Data.constr(0n, []) from all mintAssets calls — Plutus V3 minting policies do not require redeemers, and passing one causes validation failure.

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