Cabal; non-Nix support

CHANGELOG.md

@@ -20,6 +20,27 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - use `Double` rather than `FLoat` for internal calculations
     - `cursorPos`, `dt` natively `Double` already
 
+## [0.3.0] - 2025-12-08
+
+### Added
+
+- Cabal build system
+- `.gitignore` against build artifacts
+
+### Changed
+
+- versioning using the [PVP standard](https://pvp.haskell.org/), though it will remain SemVer compliant
+    - SemVer version A.B.C will become PVP version A.B.C.0
+- `README.md` overhauled to reflect new build system
+
+### Fixed
+
+- a couple non-impactful typos
+
+### Removed
+
+- `Game` module -> moved to `Main`
+
 ## [0.2.1] - 2025-12-08
 
 ### Changed