Update .gitignore to prevent accidental binary commits

.gitignore

@@ -6,6 +6,16 @@
 *.so
 *.so.*
 utun
+test_serialize
+linux-x64-deb
+
+# Temp files
+*.c1
+*.h2
+1
+
+# HTML files
+index.html
 
 # binary files
 *.exe
@@ -61,6 +71,7 @@ tests/bench_*
 
 # All log files
 *.log
+utun.log*
 
 # Local configs
 *.cfg
@@ -68,6 +79,13 @@ tests/bench_*
 utun.conf
 !utun.conf.sample
 
+# IDE/Editor directories
+.opencode/
+
+# Tool binaries
+tools/bping/bping
+tools/proxy/udp_proxy
+
 
 # MSVC temp files
 cl