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

TODO.md

@@ -21,6 +21,11 @@ fmt-check, and commit.
 
 # Completed Steps
 
+- 2026-11-07: Go code is now formatted with `gofmt` and then `golines -m 77`
+  (https://git.eeqj.de/sneak/prompts/issues/160). `prompts/REPO_POLICIES.md`
+  says how `script/fmt`, `script/fmt-check` and `script/bootstrap` do it and
+  pins `golines`. The Go style guide and both checklists say the same. `lll`
+  stays at 88, since `golines` leaves long strings and comments as they are.
 - 2026-11-06: The pinning rule in `prompts/REPO_POLICIES.md` now opens with its
   scope: what we download and install ourselves in scripts and Dockerfiles
   (https://git.eeqj.de/sneak/prompts/issues/154). Distribution packages are