fix(v4): the final review's six minors in the ROM boot

- Text after start is refused, as text.c refuses it: before it jumps, the
  ROM reads on to the end of the source; blanks, comments and the ends of
  blobs may follow, a token is ERR-AFTER (26), "text after start".
- A token too long where a name, a target or a value is wanted is "name
  too long", as text.c says: (MISSING) reports "missing" only when no error
  came first.  `", keeps "missing", which is text.c's word for both.
- text.c's "address out of range" names the address, not the value.
- The system's source files are one list, v4/sys_files.h: boot.c, the
  harness and the nucleus test are made from it.
- The ROM's error codes and words are one list, v4/rom_errors.h: boot.c's
  messages, host_map.h's ROM_ERR_* and mkmap's ERR-* are made from it.
- node.h says what v4_node_store does with a ROM address (nothing, as for
  any address outside RAM, D-14); test_host_rom_range pins it.

ROM: 2095 words, rom_hash 0x06d0dcb7a0cb41a1.  dict_hash unchanged,
0xe5a57f3eb72ff94a.  make -C v4 test test-32 hosted-check pass.  QEMU:
amd64, aarch64, riscv64 to ok>, POST 538/538, POST: PASSED.

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

v4/tests/test_text.c

@@ -540,6 +540,7 @@ int main(void)
         CHECK(ok(": T ; constant A 300 store A 5 store A+1 &T") && nb.mem[300] == 5 && nb.mem[301] == ORIGIN,
               "store puts a VALUE anywhere in RAM");
         CHECK(refused("store -1 5", "address out of range", 1), "store outside RAM is refused");
+        CHECK(refused("store 99999 5", "address out of range: 99999", 1), "store outside RAM names the address, not the value");
         CHECK(refused("store 5", "store without a value", 1), "store needs a value");
         CHECK(ok(": A ; : B ; start B") && v4_text_start(&tx) == ORIGIN + 1, "start names the word the system starts at");
         CHECK(ok(": A ;") && v4_text_start(&tx) == -1, "no start: -1");