Add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+## 1.4.0 - 2025-12-29
+
+### Major Codebase Changes
+
+- Migrated from `npm` to `pnpm` (v10.25.0)
+- Migrated from `Makefile` to `Taskfile` for all development tasks
+- Updated license from `MIT` to `BSD-3-Clause`
+- Added `license` and `author` fields to `package.json`
+- Moved Dockerfile to `docker/` folder
+- Added Nix flake for development environment
+
+### Features
+
+- Added Task section to README with available tasks
+- Improved README structure
+
+### Security
+
+- Added `eslint-plugin-security` for security linting
+- Updated Docker containers to use specific pnpm version (10.25.0)
+
+### CI/CD Updates
+
+- Updated workflows to use `task` commands
+- Added `setup-task` action to workflows
+- Updated workflows to use full action URLs with commit hashes
+- Updated Docker workflow to reference `docker/Dockerfile`
+- All workflows use pnpm with `--frozen-lockfile`
+
+### Development
+
+- Added `setup` task for enabling corepack
+- Added `install:ci` task for CI dependency installation
+- Updated Taskfile to reference `docker/Dockerfile` for Docker builds
+- Added flake.nix with Task, Node.js 20, and pnpm