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/ch9-are-you-admin.md

@@ -1,13 +1,20 @@
 ---
 title: "Are You Admin? — Buffer Overflow"
+type: "writeup"
+section: "writeups"
+status: "published"
+author: "asep"
+tags: ["gemastik", "ctf", "warmup", "pwn"]
+path: "writeups/gemastik-2026-warmup/ch9-are-you-admin.md"
+created_at: "2026-08-21T07:25:39.978Z"
+updated_at: "2026-08-21T07:25:39.978Z"
 event: "GEMASTIK 2026 Warmup"
-challenge: "Are You Admin?"
+challenge: "Are You Admin? — Buffer Overflow"
 category: "pwn"
 points: 500
 difficulty: "easy"
 flag: "GEMASTIK19{0v3rfl0w_ubah_var}"
 ---
-
 # Are You Admin? (500 pts) — Pwn / Buffer Overflow
 
 **Server:** `nc 15.232.89.109 9001`
@@ -43,4 +50,4 @@ print(s.recv(4096).decode())
 
 ## Flag
 
-`GEMASTIK19{0v3rfl0w_ubah_var}`
+`GEMASTIK19{0v3rfl0w_ubah_var}`