test: add coverage for transactions receipt command

[iborazzi]

Motivation

src/commands/transactions.ts (the transactions receipt command) had 0% test coverage, found via npx vitest run --coverage. It reads a JSON request body from --request, and had no tests for the success path or for a missing/invalid file.

Solution

Adds test/commands/transactions.test.ts covering:

• successful --request parsing and POST to /api/v2/transactions/receipt
• missing --request file
• invalid JSON in the --request file
• missing required --request option

Follows the same temp-file pattern already used in test/commands/orders.test.ts and test/parse.test.ts (mkdtempSync, not a Date.now() suffix, to avoid path collisions on concurrent runs). Coverage for this file goes from 0% to 100% statements/lines.

[ryanio]

Thanks for adding this coverage. We recreated the tests in our internal monorepo, including cleanup of the temporary directory, and they will reach this mirror in a future sync. This repository is read-only, so we're closing the PR here. We appreciate the contribution.