fix: add null guard for result.get(relPath) in typeMap backfill (#558)

The ! non-null assertion was dropped during TS migration. Added an
explicit guard with continue to skip safely when the entry is missing,
preventing silent TypeError on the subsequent property access.

Author: carlos-alm

src/domain/parser.ts

@@ -568,6 +568,7 @@ export async function parseFilesAuto(
             extracted = wasmExtractSymbols(parsers, filePath, code);
             if (extracted?.symbols?.typeMap) {
               const symbols = result.get(relPath);
+              if (!symbols) continue;
               symbols.typeMap =
                 extracted.symbols.typeMap instanceof Map
                   ? extracted.symbols.typeMap