# Main process architecture

## Startup flow

1. `src/main/main.ts` loads `appConfig` from `config/runtime-config.ts`.
2. Creates windows (`windows/window-factory.ts`).
3. Starts NodeCG with `nodecg/process-manager.ts` by running `npx nodecg start` from `lib/scoreko-dev`.
4. Waits for HTTP readiness and shows loading -> main dashboard.
5. On shutdown, runs a single graceful-stop flow to avoid orphan processes.

## Main modules

- `config/runtime-config.ts`: read/validate env vars.
- `nodecg/process-manager.ts`: start, readiness, and stop for NodeCG; install/permission/port validation in `lib/scoreko-dev`.
- `windows/window-factory.ts`: window creation and navigation policy.
- `windows/navigation-security.ts`: internal navigation allowlist and safe external schemes.
- `errors/error-presenter.ts`: fatal error presentation.
- `errors/logger.ts`: structured logging (`info/warn/error/debug`).

## Principles

- Mechanical refactors first.
- Incremental hardening with conservative fallback.
- Automated validation via `typecheck`, `build`, `test`, `doctor`, `lint`.