feat(v4): the ROM's symbol table

(FIND) ( -- rec | 0 ), (DEFINE) ( value kind -- ) and (OPCODE) ( -- op | -1 ),
entries 3-5.  Names are refused as text.c's define refuses them, compared
case by case with text.c; a set variable may be set again.  256 hash heads,
records growing up and names growing down in dictionary space, used only
while the ROM assembles.  text.c gains the data directives #, and ", (the
ROM's language; its mnemonic and reserved-word tables are data); the
nucleus image is byte-identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

v4/include/v4/text.h

@@ -49,6 +49,13 @@
  *   constant NAME VALUE
  *                    NAME is the number VALUE, as v4_text_constant gives it.
  *
+ *   #, VALUE         one cell of data at the next word address (the word
+ *                    being built is ended first).  VALUE is a number, a
+ *                    constant, CONST+N, or &NAME of a word already defined.
+ *   ", TOKEN         TOKEN, whatever its characters, as a counted string: its
+ *                    count byte, then its characters, four to a cell, low
+ *                    byte first, zero-padded to a whole cell.
+ *
  *   header NAME      a dictionary entry for NAME (capsule/dict.v4), laid down
  *                    in front of the word that the next `:` starts, and
  *                    linked to the header before it.  NAME is taken as it