SD: the weapon chooser 0x006ad2a0, whose two return values gate the loop-carried draw

Seventh lane-SD entry. The composer calls it twice just before the point-defence
pass -- once restricted to a one-element list holding 0x25, once unrestricted --
and a null from either makes the loop-carried draw cost zero, by two different
mechanisms that a word count cannot tell apart. Recording it so the next run can.

ghidra/addresses.d/lane-sd.json

@@ -48,6 +48,14 @@
       "prototype": "Mars::String -- the section's file name on a Game::ShipSectionDef; capacity word at +0x1c8, so the payload is the inline buffer when capacity < 0x10 and *(char**)(def+0x1b4) otherwise. The composer compares it case-insensitively against \"DEPointDefence\" and \"CRPointDefence\" at 0x006ae4e6/0x006ae4fd: a section whose name matches gets a point-defence weapon in EVERY qualifying bank instead of every D'-th one",
       "status": "verified",
       "source": "findings/subsystems/ship-design-composer.md -- lane SD 2026-09-08; instruction-stream read"
+    },
+    {
+      "name": "AIChooseWeaponForBank",
+      "addr": "0x006ad2a0",
+      "convention": "cdecl",
+      "prototype": "int (StrategyAIAgent* agent, int hullClass, std::vector<int>* restrictTo, int bankClass, int bankSize, void* ctx, int flag)  /* seven stack arguments, caller cleans 0x38 for the two calls at 0x006ae3c1/0x006ae3dc. Returns a weapon id, or 0 when nothing fits. The composer calls it in the weapon-assignment loop and then TWICE more just before the point-defence pass: once with a one-element list holding the literal 0x25 (read as the point-defence weapon family -- INFERRED, from the DEPointDefence/CRPointDefence section names the same pass matches and the 0.2 probability it rolls) and once unrestricted. A null from the unrestricted call skips the whole point-defence block; a null from the restricted one makes every iteration short-circuit without drawing. Both make the loop-carried draw cost zero, which is why lane SD's probe records the two return values separately */",
+      "status": "verified",
+      "source": "findings/subsystems/ship-design-composer.md -- lane SD 2026-09-08; instruction-stream read of the two call sites and the gates they feed"
     }
   ]
 }