feat(v4): the ROM assembles text as text.c does -- words, labels, macros, FOR, directives, start

word.f18: (NEXT-TOKEN) reads the console or a macro being expanded; labels,
branches by name (a label of the word, or a word, now or later), the
table of branches waiting, end of word, FOR/NEXT/UNEXT, macros, &NAME,
CONST+N, and (ONE), which dispatches a token.  A forward branch to a name
not yet defined waits on a placeholder symbol, filled in by (DEFINE).
dir.f18: constant set here #, ", store, and start, which resolves, clears
the tables the ROM used and runs the word it names.  main.f18: the ROM
itself, entry 12; on an error it stops at (ROM-FAILED) with the code and
line in its state, for the loader to report.  sym.f18 generalized: any
counted string, placeholders, a hash of only a name's own cells.

test_host_rom_asm.c gives test_text.c's own texts (accepted and refused),
its four real definitions and the ROM's directives to text.c and to the
ROM: the same words, the same errors on the same lines, at both widths.
The ROM is 2036 words.

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

v4/tests/rom_harness.h

@@ -30,7 +30,7 @@ extern const unsigned v4_rom_32_words;
 /* The entry table, in its fixed order: entry i is at V4_ROM_BASE + i. */
 static const char *const rom_entries[] = {
     "(KEY)", "(TOKEN)", "(NUMBER)", "(FIND)", "(DEFINE)", "(OPCODE)",
-    "(OP)", "(LIT)", "(BRANCH)", "(BRANCH>)", "(RESOLVE)", "(LABEL)"
+    "(OP)", "(LIT)", "(BRANCH)", "(BRANCH>)", "(RESOLVE)", "(LABEL)", "(ROM)"
 };
 #define ROM_ENTRIES (sizeof rom_entries / sizeof rom_entries[0])