Release v0.4.0 — zero-config first run

CHANGELOG.md

@@ -3,6 +3,26 @@
 All notable changes to this project are documented here. Pythonlings follows
 Semantic Versioning.
 
+## [0.4.0] - 2026-06-20
+
+### Added
+
+- Zero-config first run: `pythonlings` with no workspace creates one at
+  `~/.pythonlings` and opens the first exercise — no `init`, no `--path`, no
+  `cd` required.
+- `PYTHONLINGS_HOME` environment variable to point the default workspace
+  somewhere else.
+
+### Changed
+
+- `pythonlings init` with no `--path` now targets `~/.pythonlings` instead of
+  the current directory, so it can no longer fail by landing in a folder full
+  of unrelated files.
+- `init` is now idempotent on an existing workspace (a friendly note instead of
+  an error), and its non-empty-directory error explains how to proceed.
+- Every command resolves its workspace the same way: an explicit `--root`, then
+  the current directory if it is a workspace, then `~/.pythonlings`.
+
 ## [0.3.1] - 2026-06-20
 
 ### Fixed

Readme.md

@@ -20,14 +20,13 @@ Python documentation snippets so learners can work without leaving the terminal.
 and [uv](https://docs.astral.sh/uv/):
 
 ```bash
-uvx pythonlings init --path ./learn-python
-cd learn-python && uvx pythonlings
+uvx pythonlings
 ```
 
 How it works: **edit** the broken exercise in the built-in editor → checks
 rerun as you type and advance you to the next one. That's the whole loop.
 
-Status: `v0.3.1`, alpha — published on PyPI as `pythonlings`.
+Status: `v0.4.0`, alpha — published on PyPI as `pythonlings`.
 
 ![Coding screen](docs/assets/screenshots/coding-screen.png)
 
@@ -49,8 +48,9 @@ Status: `v0.3.1`, alpha — published on PyPI as `pythonlings`.
 
 ## What Happens When You Run It
 
-1. `pythonlings init` creates a self-contained learner workspace with exercises,
-   hidden checks, local docs, and original snapshots for reset.
+1. `pythonlings` with no workspace creates a self-contained one at
+   `~/.pythonlings` (override with `PYTHONLINGS_HOME` or `pythonlings init
+   --path <dir>`) and opens the first exercise.
 2. `pythonlings` opens the first pending exercise in the terminal UI.
 3. You edit the broken code, remove `# I AM NOT DONE`, and checks rerun as you
    work.