docs: update installation instructions in README

- Add note that npm installation is deprecated
- Add link to setup documentation
- Add WinGet installation option for Windows
- Update Homebrew to indicate MacOS/Linux support
- Mark recommended installation methods
- Improve formatting with proper indentation

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## 2.1.5
+
+- Added `CLAUDE_CODE_TMPDIR` environment variable to override the temp directory used for internal temp files, useful for environments with custom temp directory requirements
+
+## 2.1.4
+
+- Added `CLAUDE_CODE_DISABLE_BACKGROUND_TASKS` environment variable to disable all background task functionality including auto-backgrounding and the Ctrl+B shortcut
+- Fixed "Help improve Claude" setting fetch to refresh OAuth and retry when it fails due to a stale OAuth token
+
 ## 2.1.3
 
 - Merged slash commands and skills, simplifying the mental model with no change in behavior

README.md

@@ -11,30 +11,37 @@ Claude Code is an agentic coding tool that lives in your terminal, understands y
 <img src="./demo.gif" />
 
 ## Get started
+> [!NOTE]
+> Installation via npm is deprecated. Use one of the recommended methods below.
+
+For more installation options, uninstall steps, and troubleshooting, see the [setup documentation](https://code.claude.com/docs/en/setup).
 
 1. Install Claude Code:
 
-**MacOS/Linux:**
-```bash
-curl -fsSL https://claude.ai/install.sh | bash
-```
+    **MacOS/Linux (Recommended):**
+    ```bash
+    curl -fsSL https://claude.ai/install.sh | bash
+    ```
 
-**Homebrew (MacOS):**
-```bash
-brew install --cask claude-code
-```
+    **Homebrew (MacOS/Linux):**
+    ```bash
+    brew install --cask claude-code
+    ```
 
-**Windows:**
-```powershell
-irm https://claude.ai/install.ps1 | iex
-```
+    **Windows (Recommended):**
+    ```powershell
+    irm https://claude.ai/install.ps1 | iex
+    ```
 
-**NPM:**
-```bash
-npm install -g @anthropic-ai/claude-code
-```
+    **WinGet (Windows):**
+    ```powershell
+    winget install Anthropic.ClaudeCode
+    ```
 
-NOTE: If installing with NPM, you also need to install [Node.js 18+](https://nodejs.org/en/download/)
+    **NPM (Deprecated):**
+    ```bash
+    npm install -g @anthropic-ai/claude-code
+    ```
 
 2. Navigate to your project directory and run `claude`.