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CHANGELOG.md

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+# Changelog
+
+All notable changes to cargoxx will be documented in this file.
+
+## [Unreleased]
+
+### Added
+- M0 repo skeleton: hand-written `CMakeLists.txt`, bootstrap `flake.nix`,
+  empty C++23 module units for every component listed in `TECH_SPEC.md` §1
+  (`util`, `exec`, `manifest`, `lockfile`, `layout`, `linkdb`, `resolver`,
+  `codegen`, `cli`), root module `cargoxx`, and a stub `main.cpp` that
+  builds an empty `cargoxx` binary.
+- `.clang-format` (LLVM, 100-column) and `.gitignore`.
+- `SPEC.md`, `TECH_SPEC.md`.