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/logging/logging_test.go

@@ -67,9 +67,12 @@ func TestIsJSONHandler(t *testing.T) {
 		{"tint", tint.NewTextHandler(io.Discard, nil), false},
 		{"nil", nil, false},
 		{"json with attrs", slog.NewJSONHandler(io.Discard, nil).WithAttrs(
-			[]slog.Attr{slog.String("k", "v")}), true},
+			[]slog.Attr{slog.String("k", "v")},
+		), true},
 		// Only slog's own JSON handler is recognised, not one wrapped in another.
-		{"wrapped json", wrapper{slog.NewJSONHandler(io.Discard, nil)}, false},
+		{"wrapped json", wrapper{
+			Handler: slog.NewJSONHandler(io.Discard, nil),
+		}, false},
 	}
 	for _, tc := range tests {
 		t.Run(tc.name, func(t *testing.T) {