Concurrency

CHANGELOG.md

@@ -1,5 +1,31 @@
 # Changelog
 
+All notable changes to Antelope are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
 ## [Unreleased]
 
-- Initial project scaffolding.
+### Added
+- Project scaffolding: full module layout with type definitions and structural
+  skeleton across all layers (CLI, parser, evaluator, build, shell, filesystem,
+  compatibility, diagnostics).
+- CLI argument parsing with subcommand dispatch (`build`, `hunt`, `configure`).
+- `-gnu` flag for GNU Make compatibility mode (Makefile reading, full GNU Make
+  semantics, implicit rules, automatic variables, VPATH).
+- AST node, token, and error type definitions.
+- Lexer, parser, and evaluator stub modules with correct signatures.
+- Build engine skeleton: dependency graph, target metadata, scheduler, executor.
+- Shell interface stubs: command parsing, environment management, subprocess
+  execution.
+- Filesystem stubs: globbing, timestamp comparison, path resolution.
+- Compatibility layer: 13 modules covering the full GNU Make feature surface
+  (automatic variables, implicit rules, pattern rules, VPATH, target-specific
+  variables, order-only prerequisites, secondary expansion, include handling,
+  submake protocol, parallel execution, quirks, POSIX conformance).
+- Diagnostics framework: structured errors, warnings, and log-level output.
+- Documentation: architecture overview, GNU Make compatibility reference.
+- Test fixtures for integration testing (simple builds, variables, conditionals,
+  include directives).
+- Integration test verifying CLI argument parsing.