# Refactor Report

## Summary

The runtime layer was refactored to restore the missing application startup API and make the project build successfully again.

## What changed

- Added a runtime application container in [src/runtime/application.rs](../src/runtime/application.rs) with lifecycle support and shared runtime state.
- Added an application builder in [src/runtime/builder.rs](../src/runtime/builder.rs) so the binary can construct the runtime through the expected builder pattern.
- Added lightweight runtime metrics support in [src/runtime/metrics.rs](../src/runtime/metrics.rs).
- Updated the runtime module exports in [src/runtime/mod.rs](../src/runtime/mod.rs) to expose the newly introduced components.
- Set the Rust toolchain to the installed stable toolchain so builds no longer fail due to an unconfigured default toolchain.

## Verification

The changes were verified with:

```bash
export RUSTUP_TOOLCHAIN=stable-x86_64-unknown-linux-gnu && cargo build --release
```

Result:

- Build completed successfully
- Output ended with: `Finished release profile [optimized] target(s) in 1m 16s`

## Notes

This refactor focused on restoring the expected runtime API surface with minimal, compatible implementations so the existing application entrypoint and build pipeline continue to function.