Format Go with gofmt, then golines -m 77 (#161)

prompts/CODE_STYLEGUIDE_GO.md

@@ -1,13 +1,16 @@
 ---
 title: Code Styleguide — Go
-last_modified: 2026-10-18
+last_modified: 2026-11-07
 ---
 
-1.  Try to hard wrap long lines at 77 characters or less.
+1.  Format Go code with `gofmt` and then `golines -m 77`, through `make fmt`.
+    Don't commit anything `make fmt` would change. The only exception is when
+    committing things that aren't yet syntactically valid, which should only
+    happen pre-v0.0.1 or on a non-`main` branch.
 
-1.  Don't commit anything that hasn't been `go fmt`'d. The only exception is
-    when committing things that aren't yet syntactically valid, which should
-    only happen pre-v0.0.1 or on a non-`main` branch.
+1.  Hard wrap long lines at 77 characters or less. `golines` does this for code.
+    Wrap comments and long string literals by hand, since `golines` leaves them
+    as they are.
 
 1.  Even if you are planning to deal with only positive integers, use
     `int`/`int64` types instead of `uint`/`uint64` types. This is for