Describe every value kind in one table instead of spreading it over the code

A kind like colour or texture used to be spelled out in five parallel
lists, its port type, its empty value, its glyph, its label and its list
tag - 22 literal places for texture alone. core/properties/kinds.ts now
holds one row per kind and the rest is derived from it, so adding a kind
is one row. The five literal nodes collapse into literals.ts, the six
kind menus into one helper.

Number, Text, Boolean is now the one order everywhere; the variable and
port menus used to list Boolean before Text.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -140,14 +140,19 @@ shown on the node and editable in the inspector.
   neighbouring item touched. A **struct item** carries its own shape the same way: its fields are
   renamed, retyped, added (`+ Field ▾`) and removed on its own rows, which grows that one item and
   not the list. Two kinds need saying, because JSON cannot tell them from the value beside them: a
-  **colour** is a number (`{"$color": 16711680}`) and a **texture** is an id, which is a text
-  (`{"$texture": "walk-up"}`, the picker a sprite's `texture` property has – a whole picture, one
-  frame of a sheet, or an animation). A field name cannot start with `$` (`isValidFieldName`), so a
-  tag can never collide with a struct item of one field. Either reads as what it wraps on a data
+  **colour** is a number and a **texture** is an id, which is a text. Such a *tagged* kind wears its
+  name as the one key of a small object – `{"$color": 16711680}`, `{"$texture": "walk-up"}` (the
+  picker a sprite's `texture` property has – a whole picture, one frame of a sheet, or an animation).
+  A field name cannot start with `$` (`isValidFieldName`), so a tag can never collide with a struct
+  item of one field. Either reads as what it wraps on a data
   edge (`Item at`), the graph having neither colours nor pictures of its own, and `Set item` leaves
   the slot the kind it was. A **texture is a kind wherever a kind is picked** – a variable, a struct
   field, a list item, an Any port of `Properties`, a field of `Pack` – and the `Texture` node hands
-  one into the graph, as `Number` and `Text` do a number and a text. Declared (a variable, a struct
+  one into the graph, as `Number` and `Text` do a number and a text. **Every kind is one row of one
+  table** (`core/properties/kinds.ts`): its word and mark, what it travels as on an edge, its empty
+  value, how a value is read as it, whether it is tagged and where it may be picked. The kind lists,
+  the `+ …` menus, the tags, the port fields and the literal nodes all follow from the row, so a new
+  kind is that row plus, if it names something in the project, its picker. Declared (a variable, a struct
   field of one, a port) it needs no tag: the declaration says what it is, and the value is the id –
   the way a colour field is a number. A declared port of kind colour or texture carries the field
   that edits it and travels as a number or a text, since the graph has neither; a port declared as