production lines: resolve conveyor -> island placement mapping

The recipe conveyors (game_conveyor_<product>_epb) are placed as named child GameObjects
in the island_* prefabs (islands_assets_all.bundle), NOT via energy_grid (power grid only)
or any config asset. New extractor bundle/extract_conveyor_placements.py walks every island
prefab and cross-references production_lines.json -> extracted/conveyor_placements.json.

Result: Factorio (energyRods, 80mmT3Cannon, contactGrenades, armorPiercingRocket),
Kaiserplatz (energyRods, 40mmT3Cannon), Demo_Wunderinsel (70mmT3Cannon), DeusExMashineSmall
(computingModules, coralDust), testIsland(+Tramplers) (the 4 base test conveyors).

Corrects the earlier "Armory = Sprengstofffabrik hosts explosives" guess: the
LittleFactory/LittleFactoryArmory islands place NO recipe conveyors; grenades/rockets are
on Factorio. Unplaced blueprints: explosiveSmall, mechanicalParts (+ the plural
armorPiercingRockets, whose singular-named instance is on Factorio).

bundle/extract_conveyor_placements.py

@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+"""Map each world island/location to the production-line conveyors placed on it.
+
+The recipe-bearing conveyors (game_conveyor_<product>_epb) are placed as named child
+GameObjects inside the island_* prefabs in islands_assets_all.bundle (NOT via energy_grid,
+which is only the power grid, and NOT in any config/designed-environment asset). This walks
+every island prefab's Transform hierarchy, collects the conveyor instances (with local
+position), and cross-references each recipe conveyor against extracted/production_lines.json.
+
+Writes extracted/conveyor_placements.json.
+"""
+import os, sys, json, UnityPy
+
+BUNDLES = "/home/downloadpizza/sand_tools/bundles"
+PL = "/home/downloadpizza/sand_tools/extracted/production_lines.json"
+OUT = "/home/downloadpizza/sand_tools/extracted/conveyor_placements.json"
+
+
+def walk(go, seen, out):
+    """Yield (name, localPosition) for every descendant GameObject."""
+    for c in go.m_Components:
+        try:
+            co = c.read()
+        except Exception:
+            continue
+        if co.object_reader.type.name != "Transform":
+            continue
+        for ch in co.m_Children:
+            try:
+                tr = ch.read()
+                cgo = tr.m_GameObject.read()
+            except Exception:
+                continue
+            pid = cgo.object_reader.path_id
+            if pid in seen:
+                continue
+            seen.add(pid)
+            pos = getattr(tr, "m_LocalPosition", None)
+            xyz = [round(pos.x, 2), round(pos.y, 2), round(pos.z, 2)] if pos else None
+            out.append((getattr(cgo, "m_Name", "?"), xyz))
+            walk(cgo, seen, out)
+
+
+def main():
+    pl = json.load(open(PL))["production_lines"]
+    env = UnityPy.load(os.path.join(BUNDLES, "islands_assets_all.bundle"))
+    islands = {p.split("/")[-1].replace(".prefab", ""): obj
+               for p, obj in env.container.items()
+               if obj.type.name == "GameObject" and p.split("/")[-1].startswith("island_")}
+
+    result = {}
+    placed_recipes = set()
+    for iname in sorted(islands):
+        acc = []
+        walk(islands[iname].read(), set(), acc)
+        recipe_conv = []
+        unmatched = []
+        infra = []
+        for name, pos in acc:
+            base = name.replace("_epb", "")
+            # product conveyors are game_conveyor_<product> (underscore); the slot/switch/
+            # out/in pieces are game_conveyorXxx (no underscore) = generic infrastructure.
+            if base.startswith("game_conveyor_"):
+                if base in pl:
+                    recipe_conv.append({"conveyor": base, "pos": pos, "recipe": pl[base]})
+                    placed_recipes.add(base)
+                else:
+                    unmatched.append({"conveyor": base, "pos": pos})  # placed, no recipe key (name mismatch?)
+            elif name.startswith("game_conveyor"):
+                infra.append(name)
+        if recipe_conv or unmatched:
+            result[iname] = {"recipes": recipe_conv,
+                             "product_conveyors_without_matching_recipe": unmatched,
+                             "infrastructure": sorted(set(infra))}
+
+    unplaced = sorted(set(pl) - placed_recipes)
+    out = {
+        "_source": "islands_assets_all.bundle island_* prefab hierarchy "
+                   "(game_conveyor_<product>_epb child GameObjects); recipes from production_lines.json",
+        "_unplaced_recipes": unplaced,
+        "islands": result,
+    }
+    json.dump(out, open(OUT, "w"), indent=1)
+
+    def fmt(r):
+        i = " + ".join("%sx %s" % (x["amount"], x["itemId"]) for x in r["inputs"])
+        o = " + ".join("%sx %s" % (x["amount"], x["itemId"]) for x in r["outputs"])
+        return "%s -> %s (%ss)" % (i, o, r["craftTimeSeconds"])
+
+    print("wrote %s\n" % OUT)
+    for iname, d in result.items():
+        print("### %s" % iname.replace("island_", ""))
+        for rc in d["recipes"]:
+            print("   %-34s %s" % (rc["conveyor"].replace("game_conveyor_", ""), fmt(rc["recipe"])))
+        for u in d["product_conveyors_without_matching_recipe"]:
+            print("   %-34s (placed, no recipe blueprint of this exact name)" % u["conveyor"].replace("game_conveyor_", ""))
+    print("\nrecipe blueprints NOT placed on any island:", unplaced)
+
+
+if __name__ == "__main__":
+    main()