add security disclosure documents

.github/ISSUE_TEMPLATE/bug_report.md

@@ -6,18 +6,32 @@ labels: bug
 assignees: ''
 ---
 
+> **I will not respond to bug reports that are the equivalent of "It does
+> not work!"** Provide the information below — what you did, what happened,
+> what you expected, and your environment. Reports without these details
+> will be closed without response.
+
 **Describe the bug**
 What happened and what did you expect to happen?
 
 **Steps to reproduce**
-1. 
-2. 
-3. 
+1.
+2.
+3.
 
 **Environment**
-- OS: (e.g. Windows 11, Ubuntu 24.04)
+- OS: (e.g. Windows 11, Ubuntu 24.04, Steam Deck)
 - NotAlterra version: (shown in the title bar)
 - Subnautica 2 install: (Steam, Xbox, Epic, custom)
 
 **Logs**
 If available, attach `transaction.log` (located next to the binary).
+
+**Privacy**
+Do not paste save file contents, personal names, or full file paths. The
+issue is public — include only what is necessary to reproduce the problem.
+
+**Security issues**
+Do not report security vulnerabilities here. Use the repository's
+**Security** tab → **Report a vulnerability** instead, or email
+forkless@protonmail.com.