fix: improve dependency resolution for .NET Core assemblies

Enhanced the _get_reference_file function to handle scenarios where .NET Core loads framework assemblies from the shared runtime. Added logic to check for already loaded assemblies and return their locations, preventing potential loading conflicts.

Author: jmcouffin

pyrevitlib/pyrevit/runtime/__init__.py

@@ -180,6 +180,16 @@ def _get_framework_sdk_module(fw_module):
 
 def _get_reference_file(ref_name):
     mlogger.debug('Searching for dependency: %s', ref_name)
+    # On netcore the host often loads framework assemblies from the shared runtime
+    # (e.g. System.Collections.Immutable 8.x). A newer copy in bin/ may be 9.x;
+    # Assembly.LoadFrom that path then fails while the same name is already loaded.
+    if NETCORE:
+        loaded_asm = assmutils.find_loaded_asm(ref_name)
+        if loaded_asm:
+            mlogger.debug('Using host-loaded dependency: %s @ %s', ref_name,
+                          loaded_asm[0].Location)
+            return loaded_asm[0].Location
+
     # First try to find the dll in the project folder
     addin_file = framework.get_dll_file(ref_name)
     if addin_file: