update manual TODO

docs/TODO

@@ -5,29 +5,22 @@ Manual TODO file, no claude's allowed!
 === Project Documentation ===
 	- remember to periodically check the reference docs against new changes
 
+=== Simulation/Physics ===
+	- remove bodies on non closed orbits after they are a certain distance from
+		the root body, or bary-center
+	- add tests for each orbit type
+
+=== 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
+		for people who don't use ctags
+
 === Simulation Config Files ===
 	- decide on an easier to read format, likely TOML or JSON
 		- the config_loader module needs to be refactored, and likely needs some
 			logic moved to the bodies module (which should probably be renamed
 			simulation)
 
-=== Orbital Mechanics/Physics ===
-	- change orbit propagation method to Newton-Raphson
-		- tell claude to move any updated changes into 'staging' block comment for
-			easier review, and for later refactoring
-		- find some test data for solar system object orbits for verification
-		- also need tests for circular orbits, and orbits which might have anomalies
-			with simple trig equations
-		- test for orbit state after many revolutions
-		- a nice concise reference doc: https://web.mit.edu/10.001/Web/Course_Notes/NLAE/node6.html
-		- lastly test with different time steps to find an 'acceptable' error that's
-			pretty accurate, but doesn't take too many iterations. I used < 10
-			originally in orbital_shipping
-
-
-	- parabolic, and hyperbolic orbits with tests
-
-
 === rendereing ===
 	- for starters, the minimum scaling of objects should be replaced with some
 		kind of billboard system