[jeffrey-graham]

Summary

• Drops the silent "https://soroban-testnet.stellar.org" fallback on requireEnv("SOROBAN_RPC_URL") in indexer/src/index.ts so starting the indexer without SOROBAN_RPC_URL set (or with a blank string) exits immediately with [indexer] fatal: environment variable SOROBAN_RPC_URL is required but not set as documented in indexer/.env.example.
• Updates indexer/README.md Quick Start and Configuration table to mark SOROBAN_RPC_URL as required (docker-compose.yml already sets it).
• Exports requireEnv and adds unit tests in indexer/src/index.test.ts covering set, unset, and whitespace-only values.

Verification

• Ran npx tsc --noEmit, npm run lint, npm test, and npm run build in indexer/.

Closes #302

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