docs: create GEMASTIK 2026 Warmup writeups (ch1-14) via MCP DB API

- Deleted all 14 dummy docs from DB + filesystem
- Created 14 Gemastik warmup writeups + index via create_document API (DB-first)
- ch1-ch12: encoding/stego/web/pwn basics
- ch13: RSA small factors
- ch14: RSA special integers via paper-search (GCD with paper appendix primes)
- All 15 docs indexed and live at wiki.asepharyana.my.id

content/writeups/gemastik-2026-warmup/ch10-call-me.md

@@ -1,13 +1,20 @@
 ---
 title: "Call Me — ret2win"
+type: "writeup"
+section: "writeups"
+status: "published"
+author: "asep"
+tags: ["gemastik", "ctf", "warmup", "pwn"]
+path: "writeups/gemastik-2026-warmup/ch10-call-me.md"
+created_at: "2026-08-21T07:25:43.282Z"
+updated_at: "2026-08-21T07:25:43.282Z"
 event: "GEMASTIK 2026 Warmup"
-challenge: "Call Me"
+challenge: "Call Me — ret2win"
 category: "pwn"
 points: 500
 difficulty: "easy"
 flag: "GEMASTIK19{r3t2w1n_l0mpat_k3_win}"
 ---
-
 # Call Me (500 pts) — Pwn / ret2win
 
 **Server:** `nc 15.232.89.109 9002`
@@ -52,4 +59,4 @@ print(s.recv(4096).decode())
 
 ## Flag
 
-`GEMASTIK19{r3t2w1n_l0mpat_k3_win}`
+`GEMASTIK19{r3t2w1n_l0mpat_k3_win}`