🔧 chore(symbol): trace per-library file indexing

- Log each indexed .tsf file at trace level during LoadSystemLibrary.
- Include top-level symbol summary when a file is skipped for stem mismatch.

lsp-server/src/manager/symbol.cppm

@@ -248,6 +248,44 @@ namespace lsp::manager
             }
             return false;
         }
+
+        std::string DescribeTopLevelSymbols(const language::symbol::SymbolTable& table)
+        {
+            std::vector<std::string> parts;
+            for (const auto& wrapper : table.all_definitions())
+            {
+                const auto& symbol = wrapper.get();
+                switch (symbol.kind())
+                {
+                case protocol::SymbolKind::Function:
+                    parts.push_back("function:" + symbol.name());
+                    break;
+                case protocol::SymbolKind::Class:
+                    parts.push_back("class:" + symbol.name());
+                    break;
+                case protocol::SymbolKind::Module:
+                    parts.push_back("unit:" + symbol.name());
+                    break;
+                default:
+                    break;
+                }
+            }
+            if (parts.empty())
+            {
+                return "<none>";
+            }
+
+            std::string result;
+            for (std::size_t i = 0; i < parts.size(); ++i)
+            {
+                if (i > 0)
+                {
+                    result += ", ";
+                }
+                result += parts[i];
+            }
+            return result;
+        }
     }
 
     Symbol::Symbol(EventBus& event_bus) : event_bus_(event_bus)
@@ -293,9 +331,12 @@ namespace lsp::manager
                 continue;
             }
 
+            spdlog::trace("Indexing library file: {}", entry.path().string());
+
             auto table = BuildSymbolTableFromFile(entry.path());
             if (!table)
             {
+                spdlog::trace("Failed to build symbol table for: {}", entry.path().string());
                 ++failed;
                 continue;
             }
@@ -303,7 +344,10 @@ namespace lsp::manager
             auto stem = entry.path().stem().string();
             if (!HasMatchingTopLevelSymbol(*table, stem))
             {
-                spdlog::warn("Skipping system file {}: top-level symbol does not match file name", entry.path().string());
+                spdlog::warn("Skipping system file {}: top-level symbol does not match file name (stem='{}', top-level={})",
+                             entry.path().string(),
+                             stem,
+                             DescribeTopLevelSymbols(*table));
                 ++failed;
                 continue;
             }