fix: validate startup config and dotenv examples#62
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- Validate startup config; fail fast with clear messages instead of degrading at first request - Add validation rules: invalid DOWNSTREAM_MODE/AUTH_MODE, missing DOWNSTREAM_API_KEY, malformed PROVIDERS/JSON maps, anthropic-sdk without auth, responses declared without responses-capable provider - Move throw out of module top-level into exported validateStartupConfig() called from src/server.ts (keeps tests importable without a fully populated env) - Fix .env.example: every line valid dotenv syntax (prose moved into comments) Closes #58
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Summary
Why
Mux is infrastructure glue, so silent config drift is worse than a loud startup failure. This makes bad configuration fail early with actionable messages.
Testing
npm test -- --run tests/config.validation.test.ts