# ADR 0001: Rust-Native Rewrite

## Decision

`aria2-rust-pro` is a Rust-native rewrite of the current C++ Pro Core behavior.
It does not wrap the C++ implementation and does not reuse the deleted previous
Rust rewrite.

## Rationale

The project needs a maintainable Rust 2024 codebase with strict testing and
Cargo-native quality gates while preserving external aria2 compatibility.

## Consequences

- Compatibility must be proven through golden outputs and behavior tests.
- Missing behavior must be tracked in `progress.md` and the compatibility
  ledger.
- `unsafe` is forbidden unless a later ADR narrowly approves it.