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+# Config Agent Report - Wave 1 Foundation
+
+**Date:** 2026-01-27
+**Task:** Implement TOML configuration system for Rust4D
+**Status:** Complete
+
+## Summary
+
+Successfully implemented a complete TOML-based configuration system using Figment for the Rust4D engine. The system supports layered configuration with environment variable overrides.
+
+## What I Implemented
+
+### 1. Dependencies (Cargo.toml)
+
+Added to `[workspace.dependencies]`:
+- `serde = { version = "1.0", features = ["derive"] }`
+- `figment = { version = "0.10", features = ["toml", "env"] }`
+
+Added to root package `[dependencies]`:
+- `serde.workspace = true`
+- `figment.workspace = true`
+
+Added to `[dev-dependencies]`:
+- `toml = "0.8"` (for test serialization)
+
+### 2. Config Module (src/config.rs)
+
+Created a comprehensive configuration module with the following struct hierarchy:
+
+- **AppConfig** - Main configuration container
+  - **WindowConfig** - Window title, size, fullscreen, vsync
+  - **CameraConfig** - Start position, FOV, near/far planes, pitch limit
+  - **InputConfig** - Movement speed, mouse sensitivity, smoothing settings
+  - **PhysicsConfig** - Gravity, jump velocity, player radius, floor position
+  - **RenderingConfig** - Max triangles, background color, lighting settings
+  - **DebugConfig** - Overlay toggle, log level, collider visualization
+
+Key features:
+- All structs implement `Default`, `Serialize`, `Deserialize`, `Debug`, `Clone`
+- Layered loading: `config/default.toml` -> `config/user.toml` -> environment variables
+- Environment variable format: `R4D_SECTION__KEY` (e.g., `R4D_WINDOW__TITLE`)
+- Custom `ConfigError` type wrapping Figment errors
+
+### 3. Configuration Files
+
+**config/default.toml** - Version-controlled defaults matching struct defaults:
+- Window: 1280x720, windowed, vsync enabled
+- Physics: -20.0 gravity, 8.0 jump velocity
+- All settings documented inline
+
+**config/user.toml.example** - Template for user customization:
+- Shows how to override settings
+- All options commented out by default
+- Instructions to copy to user.toml
+
+### 4. Git Configuration
+
+Updated `.gitignore` to exclude `config/user.toml` so users can safely customize without affecting version control.
+
+## Commits Made
+
+1. `f40590b` - Add figment and serde to workspace dependencies
+2. `e0124e1` - Add config module with AppConfig struct hierarchy
+3. `f1e622c` - Create default.toml configuration file
+4. `faf0667` - Update .gitignore to ignore user config
+
+## Test Results
+
+```
+running 2 tests
+test config::tests::test_default_config ... ok
+test config::tests::test_config_serialization ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored;
+```
+
+## Decisions Made
+
+1. **Nested config structure** - Grouped related settings into sub-structs (Window, Camera, etc.) for better organization and to match common game engine patterns.
+
+2. **Environment variable prefix** - Used `R4D_` prefix with double-underscore section separator (`R4D_WINDOW__TITLE`) to avoid conflicts with system variables.
+
+3. **Optional user.toml** - Made user config optional (no error if missing) so the engine runs with defaults out of the box.
+
+4. **Default values in code** - All defaults are defined in Rust code, making the default.toml a convenient reference but not strictly required.
+
+5. **Matching existing hardcoded values** - Physics defaults (gravity -20.0, floor_y -2.0) match the existing constants in main.rs for easy migration.
+
+## Issues Encountered
+
+**rust4d_core compilation error** - When I started, the project wouldn't compile because `entity.rs` imported `crate::shapes::ShapeTemplate` but the shapes module wasn't declared in lib.rs. This was the Scene Agent's domain, so I left a note in the hive-mind file and continued with my file creation work. By the time I was ready to test, the Scene Agent had fixed it.
+
+## Integration Notes
+
+The config module is ready for use but currently unused in main.rs. To integrate:
+
+```rust
+use crate::config::AppConfig;
+
+fn main() {
+    let config = AppConfig::load().expect("Failed to load config");
+    // Use config.window.width, config.physics.gravity, etc.
+}
+```
+
+The existing hardcoded constants like `GRAVITY` and `FLOOR_Y` can be replaced with config values once integration is complete.
+
+## Files Modified/Created
+
+- `/home/lemoneater/Projects/Personal/Rust4D/Cargo.toml` - Added dependencies
+- `/home/lemoneater/Projects/Personal/Rust4D/src/config.rs` - New config module
+- `/home/lemoneater/Projects/Personal/Rust4D/src/main.rs` - Added `mod config;`
+- `/home/lemoneater/Projects/Personal/Rust4D/config/default.toml` - Default configuration
+- `/home/lemoneater/Projects/Personal/Rust4D/config/user.toml.example` - User template
+- `/home/lemoneater/Projects/Personal/Rust4D/.gitignore` - Added user config exclusion