fix: use Conway maxRefScriptSizePerTx limit 204,800 bytes (200 KiB)

[danbaruka]

Summary

calculateReferenceScriptFee in TxBuilderImpl.ts was rejecting transactions whose total reference script size exceeded 200,000 bytes. The Conway-era hard cap is 204,800 bytes (200 × 1024 = 200 KiB). Transactions with total reference script size between 200,001 and 204,800 bytes were incorrectly rejected by the SDK but accepted by the node.

Closes #178

Root cause

The check used a literal 200_000 instead of the ledger constant 200 * 1024:

• Before: if (totalScriptSize > 200_000)
• After: if (totalScriptSize > 204_800)

Source: Conway ledger ppMaxRefScriptSizePerTxG = 200 * 1024 (ConwayEraPParams, ADR-009). This becomes a protocol parameter in Dijkstra era (ppMaxRefScriptSizePerTxL).

Changes

• packages/evolution/src/sdk/builders/TxBuilderImpl.ts (calculateReferenceScriptFee):
  • Limit changed from 200_000 to 204_800.
  • Comment updated to document 200 × 1024 = 204,800 bytes (200 KiB), Conway hardcap, and Dijkstra protocol parameter.
  • Error message updated to say "204,800 bytes".