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/system/boot.c

@@ -8,6 +8,8 @@
 #include "v4/post.h"
 #include "v4/blocks.h"
 #include "v4/boot.h"
+#include "v4/rom_errors.h"
+#include "v4/sys_files.h"
 #include "v4/message.h"
 #include "v4/wire.h"
 #include "starkernel/capsule.h"
@@ -430,32 +432,24 @@ extern const unsigned v4_rom_32_words;
 #define EOT            4                 /* the end of the source: the ROM's (KEY) sees no more */
 
 /* The system's source, in the order the ROM reads it: the memory map, then
- * the system, then its end -- the state it is switched on in, and `start`.
- * capsules/v4/sys; each blob is a capsule like any other. */
+ * the system (v4/sys_files.h), then its end -- the state it is switched on
+ * in, and `start`.  capsules/v4/sys; each blob is a capsule like any other. */
 #define MAP_NAME_(bits) "v4:sys:map-" #bits ".f18"
 #define MAP_NAME__(bits) MAP_NAME_(bits)
 static const char *const system_blobs[] = {
+#define SYS_BLOB(file) "v4:sys:" #file ".f18",
     MAP_NAME__(V4_CELL_BITS),
-    "v4:sys:core.f18", "v4:sys:input.f18", "v4:sys:dict.f18", "v4:sys:codegen.f18", "v4:sys:compile.f18",
-    "v4:sys:quit.f18", "v4:sys:forth.f18", "v4:sys:numout.f18", "v4:sys:words.f18", "v4:sys:system.f18",
-    "v4:sys:qmath.f18", "v4:sys:blocks.f18", "v4:sys:log.f18", "v4:sys:acl.f18",
+    V4_SYS_FILES(SYS_BLOB)
     "v4:sys:end.f18",
+#undef SYS_BLOB
 };
 #define SYSTEM_BLOBS (sizeof system_blobs / sizeof system_blobs[0])
 
-/* What the ROM's error codes mean (v4/tests/host_map.h, ROM_ERR_*): the ROM
- * stops with the code, and the loader, which owns the console, says it. */
-static const char *const rom_errors[] = {
-    "", "name too long", "comment not closed", "cannot be used as a name", "already defined",
-    "too many names", "does not fit: memory is full, or a branch cannot reach", "not an opcode the packer takes there",
-    "not allowed in a macro", "macro without endmacro, or endmacro without macro",
-    "label already defined in this word", "too many labels in one word",
-    "FOR nested too deep, NEXT or UNEXT without FOR, or FOR without NEXT",
-    "FOR ... UNEXT must fit one instruction word and hold no literal", "not something to branch to",
-    "never defined", "number does not fit a cell", "& needs a word that is already defined",
-    "write the number, not @p", "a name, a target, a value or a string is missing", "macros nested too deep",
-    "too many unresolved branches", "not a value", "the source ended with no start", "start of something not a word", "address out of range",
-};
+/* What the ROM's error codes mean (v4/rom_errors.h): the ROM stops with the
+ * code, and the loader, which owns the console, says it.  Code c is entry c. */
+#define ROM_ERROR_TEXT(name, code, text) text,
+static const char *const rom_errors[] = { "", V4_ROM_ERRORS(ROM_ERROR_TEXT) };
+#undef ROM_ERROR_TEXT
 #define ROM_ERRORS (sizeof rom_errors / sizeof rom_errors[0])
 
 /* FNV-1a over the ROM, a cell at a time, low byte first, as the dictionary