# Session Summary - Documentation Rewrite

**Date:** 2026-02-04

## Session Overview
This session focused on rewriting the technical documentation to reflect the current state of the codebase after switching to analytical propagation.

## Changes Made

### 1. Explored codebase
Used @explore sub-agent to identify all critical data structures and functions across the codebase.

### 2. Created new technical reference
Rewrote `docs/technical_reference.md` from scratch:
- Updated all references from RK4 to analytical propagation
- Added comprehensive data structure documentation with file locations
- Added detailed function signatures for critical functions
- Added module dependency graph (later removed)
- Added analytical propagation algorithm details for all orbit types
- Added velocity deviation detection (1e-6 tolerance)
- Added orbital element reconstruction after burns and SOI transitions
- Kept coordinate frame strategy, orbit types, and data flow sections
- Initially had line numbers, ASCII diagrams (later removed)
- Initial version: 730 lines

### 3. Created config format documentation
New file `docs/config_format.md`:
- Complete TOML format documentation for bodies, spacecraft, maneuvers
- All field descriptions, types, units
- Parsing details and default values
- All 7 validation rules with constants
- Complete working example config
- 490 lines

### 4. Created coding standards documentation
New file `docs/coding_standards.md`:
- Code style (C-style C++, no classes/templates)
- Naming conventions
- Comment guidelines
- Whitespace rules (no trailing whitespace)
- Memory management (malloc/free)
- Code organization and layer separation
- Floating-point comparisons for tests
- Git workflow
- Build system details
- Physics considerations
- Module dependencies
- Testing guidelines

### 5. Simplified technical reference
- Moved verbose config section to config_format.md (replaced with brief summary)
- Moved config validator section to config_format.md (replaced with brief summary)
- Removed most line numbers (kept only 5 critical algorithm locations)
- Reduced from 655 lines to 557 lines

### 6. Removed ASCII diagrams
- Removed module dependency graph (replaced with text)
- Removed data flow diagrams (replaced with text)
- Removed SOI mechanics flow chart (replaced with text)
- Reduced from 557 lines to 557 lines (text descriptions were concise)

### 7. Cleaned up
- Removed `docs/technical_reference.md.backup`

## Commits
No commits were made during this session (all documentation changes).

## Results
- Created 2 new documentation files (config_format.md, coding_standards.md)
- Completely rewrote technical reference (730 lines → 557 lines)
- Documentation is now LLM-friendly (text-only, no ASCII diagrams)
- All content from original reference preserved, reorganized, and updated

## Files Modified
- `docs/technical_reference.md` - Completely rewritten
- `docs/config_format.md` - Created (490 lines)
- `docs/coding_standards.md` - Created
- `docs/technical_reference.md.backup` - Removed

## Next Steps
None - documentation rewrite is complete.

## Notes
- Technical reference is now optimized for LLM agents to understand the codebase
- Line numbers kept only for 5 critical algorithms (unlikely to change)
- Detailed config format is in separate doc for easy reference
- Coding standards are documented for consistency