add manual TODO, and tell claude not to read or edit

CLAUDE.md

@@ -16,6 +16,7 @@
   - Single small file (<100 lines) clearly needed
   - File explicitly mentioned by user
 - When reading multiple files or large files (>200 lines), always verify first
+- do not read or write to docs/TODO, this is meant to be a manually maintained file
 
 ## Code Style
 - Minimal comments - code should be self-documenting

docs/TODO

@@ -0,0 +1,29 @@
+
+Manual TODO file, no claude's allowed!
+
+
+=== Project Documentation ===
+	- update docs/implementation plan with claude, and try to condense, and remove
+		completed objectives
+		- maybe also combine with docs/verbose_project_overview ?
+		- remember to update project README if needed for changes
+
+	- add flag to Makefile for running in --headless mode for testing
+		- add this to CLAUDE.md
+
+	- the other claude generated files in docs/ are also overly verbose
+
+
+=== 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
+		- 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