Naming, layout and comments: descriptive full-word names, one item per line in wrapped calls and literals, and doc comments on exported names

Short and single-letter names in application code become full words (tests
keep theirs). Wrapped calls, signatures and composite literals put one item
per line, and one-line function bodies are expanded. Exported names and
groups of constants get doc comments, and comments refer to the renamed
identifiers.

internal/cli/fetch/once_test.go

@@ -12,7 +12,9 @@ import (
 
 // opp makes an opportunity whose releases, oldest first, have these tags.
 func opp(uuid string, tags ...string) *types.Opportunity {
-	o := &types.Opportunity{UUID: uuid}
+	o := &types.Opportunity{
+		UUID: uuid,
+	}
 	for _, tag := range tags {
 		o.Releases = append(o.Releases, types.OpportunityRelease{
 			Tags: []types.OpportunityReleaseTag{{Tag: tag}},