lib.version.Dependency: Reject unsupported spec operators

The spec split pattern ([=><]+) tokenizes only the =, > and < characters,
so a PEP 440 operator like ~= or != leaves its ~ or ! glued to the package
name: Dependency('pkg~=1.0') parses to base name 'pkg~' with operator '='.
App.__get_project_refs() carries the same pattern inline, so the same specs
corrupt the module name used for the -devel subpackage check. The split
also tolerates operator strings the language does not support, most visibly
==, which parses and renders but raises NotImplementedError only when
expansion is requested.

The spec language supports exactly =, <, <=, > and >=, and boundary
expansion implements all of them. Extend the split pattern with ~ and ! so
that foreign operators tokenize as operator strings, and reject every
operator outside the supported set in Dependency.__parsed_spec() with
Dependency.Error, naming the supported operators. Route
App.__get_project_refs() through Dependency for the name and module parts
instead of the second inline split, so the validation lives in one place.
The catch all in Dependency.__version_boundaries() stays as a backstop
against drift between the allow list and the expansion cases.

The tests drop == from the accepted operator loop, drop the now-unreachable
not-expandable case, and assert that ~=, !=, ~, ==, ===, << and >> are
rejected at parse time with a message naming the operator.

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

src/python/jw/pkg/App.py

@@ -209,8 +209,9 @@ class App(Base):
         scope: Scope,
         names_only: bool,
     ) -> None:
-        name = self.strip_module_from_spec(spec)
-        mod = re.split('([=><]+)', spec)[0].strip()
+        dep = Dependency(spec)
+        name = dep.base_name
+        mod = dep.full_name
         if names_only:
             spec = name
         if spec in buf:

src/python/jw/pkg/lib/version/Dependency.py

@@ -22,7 +22,7 @@ class Dependency:  # export
     class Error(ValueError):
         pass
 
-    __SPLIT_RE: ClassVar[re.Pattern[str]] = re.compile('([=><]+)')
+    __SPLIT_RE: ClassVar[re.Pattern[str]] = re.compile('([~=><!]+)')
 
     @property
     def __target_prefix(self) -> str:
@@ -45,6 +45,12 @@ class Dependency:  # export
             case 3:
                 if not parts[0] or not parts[2]:
                     self.__raise(f'Invalid dependency spec "{self.__spec}"')
+                if parts[1] not in ('=', '<', '<=', '>', '>='):
+                    self.__raise(
+                        f'Spec "{self.__spec}": unsupported operator '
+                        f'"{parts[1]}", supported operators are =, <, '
+                        '<=, > and >='
+                    )
                 if parts[2] == 'REVISION':
                     self.__raise(
                         f'Spec "{self.__spec}": a bare REVISION renders as a '