smpy: workspace hint prints a bare relative path that smpy add parses as a PyPI name #471

Regression from #446 (GH #442).

Problem

After creating a module that is a uv workspace member, smpy prints a hint (_echo_workspace_hint in framework/cli/simple_module_cli/cli.py):

smpy add <rel> --path <host>   # adds it as { workspace = true }

<rel> is os.path.relpath(module, host). When the module sits inside the host directory, for example host/modules/foo, that gives a bare modules/foo. parse_add_spec (git_source.py) only treats specs starting with ., / or ~ as paths, so smpy add modules/foo is parsed as a PyPI requirement and the copied command fails.

The common layout, with the module next to the host, gives ../modules/foo and works.

Fix

Prefix a bare relative path with ./ in the hint:

if not rel.startswith("."):
    rel = f"./{rel}"

Add a test covering a module inside the host dir.