feat: justfile task runner and updated install/setup documentation

justfile with build/install/uninstall/test targets. CLAUDE.md updated with
new install path and commands. status-line-setup.md updated for
%LOCALAPPDATA%\ctask\bin location.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/status-line-setup.md

@@ -4,33 +4,44 @@
 
 ctask includes helper scripts that display task context in Claude Code's status line.
 
+### Prerequisites
+
+Run `scripts/install.ps1` (or `just install`) first. This places the helper scripts at:
+
+- Windows: `%LOCALAPPDATA%\ctask\bin\ctask-statusline.sh`
+- Unix: copy `scripts/ctask-statusline.sh` to `~/.local/bin/`
+
 ### Setup
 
-Add one of the following to your `~/.claude/settings.json`:
+Add the following to your `~/.claude/settings.json`:
 
-**Linux / macOS (bash):**
+**Windows (after install):**
 
 ```json
 {
   "statusLine": {
     "type": "command",
-    "command": "bash /path/to/ctask-statusline.sh"
+    "command": "bash /c/Users/<you>/AppData/Local/ctask/bin/ctask-statusline.sh"
   }
 }
 ```
 
-**Windows (PowerShell):**
+Replace `<you>` with your Windows username.
+
+**Linux / macOS:**
 
 ```json
 {
   "statusLine": {
     "type": "command",
-    "command": "powershell -NoProfile -File C:\\path\\to\\ctask-statusline.ps1"
+    "command": "bash ~/.local/bin/ctask-statusline.sh"
   }
 }
 ```
 
-Replace `/path/to/` with the actual location of the script.
+### Verify
+
+Run `ctask doctor` to check that the status line is configured correctly.
 
 ### Output