iOS inner loop: sort mlaunch by pack version dir; split msbuildargs on space and semicolon

- _resolve_mlaunch now sorts on the pack <version> directory (parent of
  tools/) rather than the pack-name suffix, so 26.10 ranks above 26.2.
- The inner-loop proj builds _MSBuildArgs with a mix of ';' and space
  separators; splitting --msbuild-args on ';' alone left embedded spaces
  inside arguments and broke 'dotnet build'. Split on both.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: kotlarmilos

src/scenarios/shared/ioshelper.py

@@ -76,10 +76,10 @@ def __init__(self):
 
     @staticmethod
     def _resolve_mlaunch():
-        """Resolve the mlaunch binary from the iOS SDK pack.
+        """Resolve the mlaunch binary from the newest installed Microsoft.iOS.Sdk pack.
 
-        Searches $DOTNET_ROOT/packs/Microsoft.iOS.Sdk.*/tools/bin/mlaunch,
-        falling back to ~/.dotnet if DOTNET_ROOT is unset. Caches the result.
+        Sorts candidates by the pack *version* directory (parent of `tools/`),
+        not by the pack name, so e.g. 26.10 ranks above 26.2.
         """
         if iOSHelper._mlaunch_path is not None:
             return iOSHelper._mlaunch_path
@@ -94,10 +94,9 @@ def _resolve_mlaunch():
             )
 
         def _version_key(p: str):
-            m = re.search(r'Microsoft\.iOS\.Sdk\.([^/\\]+)', p)
-            if not m:
-                return ()
-            parts = re.split(r'[.\-+]', m.group(1))
+            # Path is .../packs/<pack>/<version>/tools/bin/mlaunch — sort on <version>.
+            version_dir = os.path.basename(os.path.dirname(os.path.dirname(os.path.dirname(p))))
+            parts = re.split(r'[.\-+]', version_dir)
             key = []
             for part in parts:
                 key.append((0, int(part)) if part.isdigit() else (1, part))

src/scenarios/shared/runner.py

@@ -1141,7 +1141,10 @@ def run(self):
             if self.framework:
                 base_cmd.extend(['-f', self.framework])
             if self.msbuildargs:
-                base_cmd.extend([arg for arg in self.msbuildargs.split(';') if arg])
+                # _MSBuildArgs in the proj uses both ';' and ' ' as separators.
+                for arg in re.split(r'[;\s]+', self.msbuildargs):
+                    if arg.strip():
+                        base_cmd.append(arg.strip())
 
             project_dir = os.path.dirname(os.path.abspath(self.csprojpath))
             exename = self.traits.exename