test: add comprehensive multi-line JSON parsing tests for ripgrep results

  Expand test coverage for parseRipgrepResults to simulate realistic
  ripgrep --json output with multiple JSON objects per line.

  - Add multi-line JSON test with begin/match/end sequence
  - Test graceful handling of malformed JSON lines
  - Add edge cases for empty and whitespace-only input
  - Better coverage of real-world ripgrep output scenarios

Author: kubrickcode

src/src/core/tlog-search.test.ts

@@ -45,5 +45,52 @@ describe("TLOG Search Functions", () => {
 
       expect(result).toHaveLength(0);
     });
+
+    test("parses multi-line ripgrep JSON output", () => {
+      const multiLineInput = `{"type":"begin"}
+{"type":"match","data":{"path":{"text":"/path/file1.ts"},"lines":{"text":"  console.log(\\"[TLOG] first match\\");"},"line_number":5,"submatches":[{"start":2}]}}
+{"type":"match","data":{"path":{"text":"/path/file2.ts"},"lines":{"text":"console.log(\\"[TLOG] second match\\");"},"line_number":12,"submatches":[{"start":0}]}}
+{"type":"end","data":{"elapsed_total":{"secs":0,"nanos":123456}}}`;
+      
+      const result = parseRipgrepResults(multiLineInput);
+
+      expect(result).toHaveLength(2);
+      expect(result[0]).toEqual({
+        filePath: "/path/file1.ts",
+        line: 4, // 0-based
+        column: 2,
+        content: 'console.log("[TLOG] first match");',
+      });
+      expect(result[1]).toEqual({
+        filePath: "/path/file2.ts",
+        line: 11, // 0-based  
+        column: 0,
+        content: 'console.log("[TLOG] second match");',
+      });
+    });
+
+    test("handles malformed JSON lines gracefully", () => {
+      const malformedInput = `{"type":"begin"}
+malformed-json-line
+{"type":"match","data":{"path":{"text":"/path/file.ts"},"lines":{"text":"console.log(\\"[TLOG] test\\");"},"line_number":10,"submatches":[{"start":5}]}}
+{"incomplete": json
+{"type":"end"}`;
+      
+      const result = parseRipgrepResults(malformedInput);
+
+      expect(result).toHaveLength(1);
+      expect(result[0]).toEqual({
+        filePath: "/path/file.ts",
+        line: 9,
+        column: 5,
+        content: 'console.log("[TLOG] test");',
+      });
+    });
+
+    test("handles empty and whitespace-only input", () => {
+      expect(parseRipgrepResults("")).toEqual([]);
+      expect(parseRipgrepResults("   \n  \t  ")).toEqual([]);
+      expect(parseRipgrepResults("\n\n\n")).toEqual([]);
+    });
   });
 });