chore: initial sanitized public snapshot

docs/project-origins.md

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+# Project Origins
+
+`aria2-rust-pro` is an independently maintained Rust implementation. It uses
+the following projects as explicit compatibility and migration references.
+
+## Aria2-Pro-Core
+
+[Aria2-Pro-Core](https://github.com/P3TERX/Aria2-Pro-Core) is the direct
+reference for the enhanced deployment profile and migration expectations that
+this project supports. Its behavior informs compatibility work; it is not this
+repository's release source.
+
+## aria2
+
+[aria2](https://github.com/aria2/aria2) is the upstream download utility whose
+CLI, configuration, RPC, and protocol contracts guide this implementation.
+
+## Relationship
+
+This repository has its own Rust codebase, release process, and issue tracker.
+Compatibility claims describe the intended user-facing behavior; they do not
+make this repository an official release of either reference project.