Resolve call-script dispatch: id = raw SYS4INI file index

Native-RE (Ghidra) cracked call-script <id> (opcode 0x03): its handler
FUN_0041bc90 -> loader FUN_0040e980 -> resolver FUN_0044f390 indexes an
80-byte record table at base + id*0x50 == the SYS4INI record layout. So
`call-script <id>` is a direct RAW index into the SYS4INI global file
table (the asset index we already parse) -- there is no separate on-disk
id->code registry. This resolves name-resolution.md #1, statically, no
Frida.

Confirmed: all 297 distinct corpus call-script ids resolve to a .BIN
script with a semantically-exact name (0x1ab->ADDITEM, 0x2ae7->MES,
0x143->BUNKI, 0x329d->CALCREVISE), 0 out-of-range, 0 alternate-pack.
Companion op 0x8f `call` is an intra-script JSR (FUN_0041fba0), not
cross-script.

- parse_sys4ini.py: preserve `raw_index` per entry (= the engine file id;
  index the RAW records incl. '@' placeholders) + emit
  build/callscript-names.json (id->name).
- sys4load.py: annotate `call-script 0x1ab =ADDITEM.BIN`.
- opcodes.toml 0x03/0x8f refined (source=investigation, confidence high,
  handler VAs) + rebuilt opcode-reference.md.
- docs: engine-re.md (op 0x03 section + backlog re-aimed),
  name-resolution.md #1 (SOLVED), script-inventory.md (call graph +
  living-reference decision), tools-reference.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/parse_sys4ini.py

@@ -115,13 +115,18 @@ def parse(path: Path) -> dict:
                          f"have {len(blob)} decompressed bytes)")
 
     files = []
-    for _ in range(file_count):
+    for i in range(file_count):
         name_b, arc_id, file_number, offset, size = struct.unpack_from(FILE_ENTRY_FMT, blob, p)
         p += FILE_ENTRY_LEN
         name = _cstr(name_b)
         if name == "@" or not name:
             continue
         files.append({
+            # raw_index = the record's 0-based position in the SYS4INI table INCLUDING '@'
+            # placeholders. This is the engine's universal file id: `call-script <id>` and every
+            # script/asset load index by it (engine FUN_0044f390: record = base + id*0x50). It is
+            # NOT the same as this entry's position in `files` (which omits placeholders).
+            "raw_index": i,
             "name": name,
             "archive": archives[arc_id] if 0 <= arc_id < arc_count else None,
             "arc_id": arc_id,
@@ -215,6 +220,15 @@ def main() -> int:
     out.write_text(json.dumps(index, ensure_ascii=False, indent=1), encoding="utf-8")
     print(f"-> {out.relative_to(paths.REPO)}")
 
+    # call-script id -> name map (raw_index keyed). `call-script <id>` (opcode 0x03) is a direct
+    # raw index into the SYS4INI file table, so this IS the call-graph name registry that
+    # name-resolution.md #1 needed (confirmed via native-RE, see docs/engine-re.md). sys4load reads
+    # it to annotate `call-script 0x1ab =ADDITEM`.
+    cs = {str(f["raw_index"]): f["name"] for f in index["files"]}
+    cs_out = paths.BUILD / "callscript-names.json"
+    cs_out.write_text(json.dumps(cs, ensure_ascii=False, indent=0), encoding="utf-8")
+    print(f"-> {cs_out.relative_to(paths.REPO)} ({len(cs)} ids)")
+
     if do_check:
         print("--- validation ---")
         return 1 if check(index) else 0