App.__get_project_refs(): Fix recursion stop conditions

App.__get_project_refs() recurses into the package dependency graph, but
the recursion end conditions only work well if all required packages are
present. Whether a required package is installed or not is decided upon a
wrong condition, however - existence of the project's project directory,
which may or may not be misleading for both the -devel and the -run
requirements. This can lead to various unwanted outcomes: Missing packages
happily inserted into the recursion buffer, process termination instead of
recursion stop, path lookup errors instead of a clearer "unmet dependency"
message (No project path found for module xyz, Failed to find directory of
project foo).

This commit cleanly detects if -run or -devel are installed and makes the
walk stop or raise under the appropriate conditions:

1. -run missing but required, raises unmet dependency
2. -devel missing but required, raises unmet dependency
3. -run present, no -devel required, stop recursing

Signed-off-by: Jan Lindemann <jan@janware.com>
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.85.1

src/python/jw/pkg/App.py

@@ -105,6 +105,10 @@ class App(Base):
         # run: the -run package is installed: a VERSION file is
         # present in the project directory or
         # /usr/share/doc/packages.
+        if devel and name == self.__top_name:
+            # the topdir is the project's own buildable checkout
+            if os.path.exists(f'{self.__topdir}/make/project.conf'):
+                return True
         search, file = (
             (self.__projs_root, self.___opt_root),
             '/make/project.conf'