diff --git a/docs/developer-guide.md b/docs/developer-guide.md
index f568f53..983d2c1 100644
--- a/docs/developer-guide.md
+++ b/docs/developer-guide.md
@@ -464,7 +464,6 @@ crates/rust4d_render/src/
 │   └── types.rs         # GPU-compatible data structures
 ├── renderable.rs        # RenderableGeometry: World to GPU buffers
 └── shaders/
-    ├── slice.wgsl       # Legacy 5-cell slicing (compute)
     ├── slice_tetra.wgsl # Tetrahedra slicing (compute)
     └── render.wgsl      # 3D rendering (vertex + fragment)
 ```
diff --git a/scratchpad/plans/engine-roadmap-2026/phase-1-foundation.md b/scratchpad/plans/engine-roadmap-2026/phase-1-foundation.md
index e377179..8f3d0b0 100644
--- a/scratchpad/plans/engine-roadmap-2026/phase-1-foundation.md
+++ b/scratchpad/plans/engine-roadmap-2026/phase-1-foundation.md
@@ -1,12 +1,21 @@
 # Phase 1: Foundation - Scene Serialization & Configuration System
 
 **Created:** 2026-01-27
-**Status:** Ready
+**Updated:** 2026-01-28
+**Status:** COMPLETE
 **Priority:** P0 (Critical Foundation)
 **Total Effort:** 4 sessions (2 sessions per track)
 
 ---
 
+**COMPLETION NOTE (2026-01-28)**: This phase was completed with the following notes:
+- Phase 1A (Scene Serialization): Complete - RON format working for scenes
+- Phase 1B (Configuration System): Complete - TOML config with figment for hierarchical overrides
+- `ColliderTemplate` was not implemented as planned; colliders are created from entity tags instead
+- The physics body creation uses a simpler approach without explicit ColliderTemplate types
+
+---
+
 ## Overview
 
 Phase 1 establishes the foundational infrastructure for content creation and user customization. It consists of two parallel tracks that can be developed independently:
diff --git a/scratchpad/plans/engine-roadmap-2026/phase-2-scene-management.md b/scratchpad/plans/engine-roadmap-2026/phase-2-scene-management.md
index 1bb5c7d..489bf65 100644
--- a/scratchpad/plans/engine-roadmap-2026/phase-2-scene-management.md
+++ b/scratchpad/plans/engine-roadmap-2026/phase-2-scene-management.md
@@ -1,12 +1,23 @@
 # Phase 2: Scene Management
 
 **Created:** 2026-01-27
-**Status:** Ready
+**Updated:** 2026-01-28
+**Status:** COMPLETE
 **Sessions:** 3 (1 for 2A, 2 for 2B)
 **Priority:** P1 - High
 
 ---
 
+**COMPLETION NOTE (2026-01-28)**: This phase was completed with the following differences from the original plan:
+- Phase 2A (Scene Manager): Complete - Basic scene management implemented
+- Phase 2B (Prefab System): Implemented as `EntityTemplate` instead of a separate `Prefab` struct
+  - EntityTemplate provides the same core functionality (reusable entity definitions)
+  - Override support was descoped for simplicity
+  - Children/nested prefabs were not implemented
+- The simpler EntityTemplate approach was chosen to avoid over-engineering before real use cases emerged
+
+---
+
 ## Overview
 
 Phase 2 adds multi-scene support and a prefab system to Rust4D. This phase enables scene switching (menus, levels, overlays) and runtime entity spawning from templates.
diff --git a/scratchpad/plans/engine-roadmap-2026/phase-3-documentation.md b/scratchpad/plans/engine-roadmap-2026/phase-3-documentation.md
index 56b5ea8..44c6ec0 100644
--- a/scratchpad/plans/engine-roadmap-2026/phase-3-documentation.md
+++ b/scratchpad/plans/engine-roadmap-2026/phase-3-documentation.md
@@ -1,13 +1,28 @@
 # Phase 3: Documentation
 
 **Created:** 2026-01-27
-**Status:** Ready
+**Updated:** 2026-01-28
+**Status:** COMPLETE
 **Priority:** P2
 **Estimated Effort:** 4-5 sessions
 **Dependencies:** None (can run in parallel with other phases)
 
 ---
 
+**COMPLETION NOTE (2026-01-28)**: This phase was completed. Documentation files created:
+- **Phase 3A (Quick Wins)**: Complete
+  - `examples/` directory with 4 working examples (01-04)
+  - `examples/README.md` with example index
+  - Enhanced `README.md` with project status, 4D explanation, features
+  - `ARCHITECTURE.md` with Mermaid diagrams showing system design
+- **Phase 3B (Comprehensive Guides)**: Complete
+  - `docs/getting-started.md` - New user onboarding guide
+  - `docs/user-guide.md` - Comprehensive manual
+  - `docs/developer-guide.md` - Internals and contribution guide
+  - `docs/README.md` - Documentation index page
+
+---
+
 ## Overview
 
 Phase 3 establishes comprehensive user-facing and contributor-facing documentation for Rust4D. Currently, the codebase has strong internal documentation (doc comments) but lacks external resources for users and contributors to understand and use the engine effectively.