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>

CLAUDE.md

@@ -4,25 +4,49 @@
 
 This project is a local-only Go CLI. It is not published to any package registry or remote repository.
 
-### Local build
+### Prerequisites
 
-```
+- Go 1.26+ (`winget install GoLang.Go`)
+- just (optional task runner: `winget install Casey.Just`)
+
+### Install on Windows
+
+```powershell
 cd C:\Users\Warren\claude_tasks\ctask_v0.1
-go build -o ctask.exe .
+powershell -NoProfile -ExecutionPolicy Bypass -File scripts/install.ps1
 ```
 
-### Local install (copies to GOPATH/bin)
+Or with just: `just install`
 
-```
+This builds from the local repo, copies files to `%LOCALAPPDATA%\ctask\bin`, and adds the directory to user PATH.
+
+| Installed file | Location |
+|---|---|
+| ctask.exe | %LOCALAPPDATA%\ctask\bin\ctask.exe |
+| ctask-statusline.sh | %LOCALAPPDATA%\ctask\bin\ctask-statusline.sh |
+| ctask-statusline.ps1 | %LOCALAPPDATA%\ctask\bin\ctask-statusline.ps1 |
+
+### Uninstall
+
+```powershell
 cd C:\Users\Warren\claude_tasks\ctask_v0.1
-go install .
+powershell -NoProfile -ExecutionPolicy Bypass -File scripts/uninstall.ps1
 ```
 
-Binary output: `C:\Users\Warren\go\bin\ctask.exe`
+Or with just: `just uninstall`
+
+Removes only ctask files and the PATH entry (if ctask install added it). Does NOT remove workspaces or task data.
+
+### Dev build (no install)
+
+```
+just build    # or: go build -o ctask.exe .
+just test     # or: go test ./... -v -count=1
+```
 
 ### Remote install
 
-Not available. There is no git remote configured and the module path in `go.mod` is a local placeholder. Do not provide `go install <module>@latest` commands or any remote install instructions.
+Not available. There is no git remote configured. Do not provide `go install <module>@latest` commands.
 
 ## Repository and Package Identity
 
@@ -33,13 +57,14 @@ Never invent remote repository, package, or module identities. Do not guess GitH
 Bad: `go install github.com/someone/ctask@latest`
 Bad: `git clone https://github.com/someone/ctask.git`
 
-Good: `cd C:\Users\Warren\claude_tasks\ctask_v0.1 && go install .`
-Good: "This project is not published remotely. Build locally with `go install .`"
+Good: `just install` or `powershell -File scripts/install.ps1`
+Good: "This project is not published remotely. Build and install locally."
 
 ## Testing
 
 ```
-go test ./... -v -count=1
+just test
+# or: go test ./... -v -count=1
 ```
 
 ## Data Safety