feat: jump to a line with counted g

src/main.rs

@@ -23,6 +23,7 @@ Normal: i/a insert, I/A insert at first nonblank/end, o/O new line
         Normal/Visual: f<char>/F<char> seek next/previous on current line; 2fx seeks second x
         gf follows Markdown file links/reference links and heading fragments (no LSP)
         Normal/Visual: gt first line, gb last line, at first nonblank; Esc cancels g
+        Normal/Visual: <line>g jumps to that one-based source line at first nonblank, clamped at EOF
         Ctrl+o older jump location; Ctrl+i/Tab newer (counts supported)
         _ splits above/below, | left/right; Option/Alt+h/j/k/l focuses neighboring panes
         Ctrl+Option/Alt+h/l previous/next tab; :tab.new opens current buffer in another tab