fix: validate To BCD scheme option

[puneetdixit200]

Description

Adds validation for the To BCD scheme argument so malformed recipe URLs with an empty scheme return a controlled operation error instead of an uncaught TypeError.

Existing Issue

Closes #2488

Screenshots

N/A

AI disclosure

I used OpenAI Codex to inspect the existing BCD operation/tests, add the regression test, and run verification. I reviewed the code and test output.

Test Coverage

• node --no-warnings --no-deprecation --openssl-legacy-provider --input-type=module -e 'import TestRegister from "./tests/lib/TestRegister.mjs"; await import("./tests/operations/tests/BCD.mjs"); const results = await TestRegister.runTests(); const failed = results.filter(r => r.status !== "passing"); console.log(JSON.stringify(failed.map(r => ({name: r.test.name, status: r.status, output: r.output})), null, 2)); process.exit(failed.length ? 1 : 0);'
• npm test
• npm run lint
• git diff --check

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