fix: normalize language name for C# files in RepoMap

Co-authored-by: cecli (openai/openai_gemini_cli/gemini-2.5-pro)

Author: szmania

cecli/repomap.py

@@ -587,8 +587,6 @@ def check_import_match(self, definer, imports):
 
     def get_tags_raw(self, fname, rel_fname):
         lang = filename_to_lang(fname)
-        if lang == "c_sharp":
-            lang = "csharp"
 
         if not lang:
             return
@@ -601,7 +599,8 @@ def get_tags_raw(self, fname, rel_fname):
                 print(f"Skipping file {fname}: {err}")
             return
 
-        query_scm = get_scm_fname(lang)
+        scm_lang = "csharp" if lang == "c_sharp" else lang
+        query_scm = get_scm_fname(scm_lang)
         if not query_scm.exists():
             return
         query_scm = query_scm.read_text()