docs: Update project context and session notes

Summarizes recent implementations including Asset Management, audio/visual fixes, and style improvements.

4 files changed, 55 insertions, 10 deletions

diff --git a/PROJECT_CONTEXT.md b/PROJECT_CONTEXT.md
index 28f86f8..acc0b43 100644
--- a/PROJECT_CONTEXT.md
+++ b/PROJECT_CONTEXT.md
@@ -36,30 +36,45 @@ Incoming tasks in no particular order:
 - [x] 8. add a #define STRIP_ALL to remove all unnecessary code for the final build
      (for instance, command-line args parsing, or unnecessary options, constant
       parameters to function calls, etc.)
-- [ ] 9. work on the compact in-line and off-line asset system (@ASSET_SYSTEM.md)
-- 9. work on the compact in-line and off-line asset system (@ASSET_SYSTEM.md)
+- [x] 9. work on the compact in-line and off-line asset system (@ASSET_SYSTEM.md)
 
 ## Session Decisions and Current State
 
+### Asset Management System:
+- **Architecture**: Implemented a C++ tool (`asset_packer`) that bundles external files into the binary.
+- **Descriptors**: Assets are defined in `assets/final/assets.txt` with optional compression settings.
+- **Runtime Access**: Provides a type-safe `AssetId` enum and `GetAsset` function for retrieving raw byte data at runtime.
+- **Integration**: Fully integrated into the CMake build process with automatic header/source generation.
+- **Lazy Decompression**: Scaffolding implemented for future on-demand decompression support.
+
 ### Audio Engine (Synth):
 - **Architecture**: Real-time additive synthesis from spectrograms using Inverse Discrete Cosine Transform (IDCT).
 - **Dynamic Updates**: Implemented a double-buffering (flip-flop) mechanism for thread-safe, real-time updates of spectrogram data. The main thread writes to a back buffer, which is then atomically swapped to become the active front buffer for the audio thread, avoiding real-time allocations and locks.
+- **Peak Detection**: Real-time output peak detection with exponential decay for smooth visual synchronization.
 - **Sample Generation**: Samples are generated in the frequency domain (spectrograms) and converted to time-domain audio using IDCT with a Hamming window.
 - **Audio Input Support (`spectool`)**: Supports WAV and MP3 input for analysis (leveraging `miniaudio`'s built-in decoders). AAC is explicitly *not* supported due to complexity and dependency constraints.
 
 ### Tools Developed:
 - `spectool`: A command-line tool for analyzing WAV/MP3 files into `.spec` spectrogram format and for playing back `.spec` files through the synth engine.
 - `specview`: A command-line tool for visualizing `.spec` spectrogram files in ASCII art.
+- `asset_packer`: A build-time tool for embedding assets into the binary.
 
 ### WebGPU Integration:
 - **Strategy**: Uses system-installed `wgpu-native` (e.g., via Homebrew) for the implementation.
 - **Surface Creation**: Uses `glfw3webgpu` helper library to abstract platform-specific surface creation from GLFW windows, keeping the codebase clean and cross-platform.
 - **Headers**: Uses standard `<webgpu.h>` provided by the system install.
+- **Visuals**: Pulsating heptagon synchronized with audio peaks, with automatic aspect ratio correction.
 
 ### Coding Style:
 - **Standard**: Adopted a consistent coding style enforced by `.clang-format`.
 - **Rules**: 2-space indentation, no tabs, 80-column line limit.
+- **Headers**: Mandatory 3-line descriptive header at the top of every `.h` and `.cc` file.
 - **File Extension**: All C++ source files renamed from `.cpp` to `.cc`.
 
+### Platform & Input:
+- **Windowing**: Uses GLFW for cross-platform window management.
+- **Input**: Supports 'Esc' and 'Q' for quitting, and 'F' for toggling fullscreen.
+
 ### Development Workflow:
 - **Commit Policy**: Explicit rule to always run the full test suite before preparing any commit, documented in `CONTRIBUTING.md`.
+- **Testing**: Comprehensive test suite including `AssetManagerTest`, `SynthEngineTest`, `HammingWindowTest`, and `SpectoolEndToEndTest`.
diff --git a/SESSION_NOTES.md b/SESSION_NOTES.md
index 55e4fc1..77ff1be 100644
--- a/SESSION_NOTES.md
+++ b/SESSION_NOTES.md
@@ -21805,4 +21805,32 @@ why is clang-format taking so long?
 
 ## USER 🧑‍💻
 
-why is clang-format taking so long?
\ No newline at end of file
+why is clang-format taking so long?
+---
+
+## Session Summary (Jan 28, 2026)
+
+### Accomplishments:
+1.  **Asset Management System**:
+    *   Created ASSET_SYSTEM.md to define the architecture.
+    *   Developed tools/asset_packer.cc to bundle external files as hex-encoded C arrays.
+    *   Integrated into CMake with automatic assets.h and assets_data.cc generation.
+    *   Added AssetManagerTest to verify integrity.
+2.  **Code Quality & Style**:
+    *   Established a rule in CONTRIBUTING.md requiring a 3-line descriptive header for all source files.
+    *   Performed a project-wide pass to apply these headers to all .h and .cc files.
+    *   Updated clang-format command to exclude large directories (assets/, archive/, third_party/).
+3.  **Visuals & Audio**:
+    *   Implemented exponential decay for audio peaks to create a smooth 'peak meter' effect for visuals.
+    *   Added aspect ratio correction to the WGSL shader to prevent distortion on resize.
+    *   Fixed a critical bug where STRIP_ALL was removing shader entry point names.
+4.  **Platform & Build**:
+    *   Added 'Q' key as an alternative to 'Esc' for quitting.
+    *   Optimized macOS build flags (-dead_strip instead of --gc-sections).
+    *   Improved scripts/crunch_demo.sh to use strip and gzexe on macOS, achieving a ~48KB compressed binary.
+5.  **Documentation**:
+    *   Updated PROJECT_CONTEXT.md, HOWTO.md, and GEMINI.md with new systems and instructions.
+
+### Status:
+*   Tasks 1, 2, 3, 7, 8, and 9 from the original list are now **Complete**.
+*   The demo is fully functional with audio-visual synchronization and fits within the 64k limit on macOS.
diff --git a/src/audio/synth.cc b/src/audio/synth.cc
index 8380301..2242d5c 100644
--- a/src/audio/synth.cc
+++ b/src/audio/synth.cc
@@ -35,7 +35,8 @@ static struct {
 } g_synth_data;
 
 static Voice g_voices[MAX_VOICES];
-static volatile float g_current_output_peak = 0.0f; // Global peak for visualization
+static volatile float g_current_output_peak =
+    0.0f; // Global peak for visualization
 
 void synth_init() {
   memset(&g_synth_data, 0, sizeof(g_synth_data));
@@ -183,9 +184,8 @@ void synth_render(float *output_buffer, int num_frames) {
     output_buffer[i * 2 + 1] = right_sample;
 
     // Update the peak with the new max (attack)
-    g_current_output_peak =
-        fmaxf(g_current_output_peak,
-              fmaxf(fabsf(left_sample), fabsf(right_sample)));
+    g_current_output_peak = fmaxf(
+        g_current_output_peak, fmaxf(fabsf(left_sample), fabsf(right_sample)));
   }
 }
 
@@ -199,4 +199,6 @@ int synth_get_active_voice_count() {
   return count;
 }
 
-float synth_get_output_peak() { return g_current_output_peak; }
+float synth_get_output_peak() {
+  return g_current_output_peak;
+}
diff --git a/tools/asset_packer.cc b/tools/asset_packer.cc
index 8696646..1e29578 100644
--- a/tools/asset_packer.cc
+++ b/tools/asset_packer.cc
@@ -113,8 +113,8 @@ int main(int argc, char *argv[]) {
                           << (i == buffer.size() - 1 ? "" : ", ");
     }
     assets_data_cc_file << "\n};\n";
-    assets_data_cc_file << "const size_t ASSET_SIZE_" << asset_name
-                        << " = " << buffer.size() << ";\n\n";
+    assets_data_cc_file << "const size_t ASSET_SIZE_" << asset_name << " = "
+                        << buffer.size() << ";\n\n";
 
     asset_id_counter++;
   }