update manual TODO

docs/TODO

@@ -1,4 +1,4 @@
-=== ATTENTION CLAUDE ===
+=== ATTENTION LLM ======
 DO NOT read, write, edit, restore, or commit this file under any circumstances.
 This is a manually maintained file - all changes must be made by humans only.
 If you see modifications to this file in git status, IGNORE them and do not commit.
@@ -8,14 +8,6 @@ If you see modifications to this file in git status, IGNORE them and do not comm
 === Project Documentation ===
     - remember to periodically check the reference docs against new changes
 
-=== Simulation Config Files ===
-    - the config_loader module needs to be refactored, and likely needs some
-        logic moved to the bodies module (which should probably be renamed
-        simulation)
-    - config file validation
-        - check for unrealistic orbital parameters
-        - relative coordinates for child bodies
-
 === Simulation/Physics ===
     - remove bodies on non closed orbits after they are a certain distance from
         the root body, or bary-center
@@ -25,6 +17,10 @@ If you see modifications to this file in git status, IGNORE them and do not comm
         SOI
     - move the example binary system config to test configs, and make some tests
 
+=== Simulation Config Files ===
+    - relative coordinates for child bodies
+    - a format with nested children would be nice
+
 === CTAGS ===
     - previously we've used the Makefile to generate tags when building,
         let's think about a way we can generate them without causing a conflict