CNN v2 Web Tool: Unify layer terminology and add binary format spec

- Rename 'Static (L0)' → 'Static' (clearer, less confusing)
- Update channel labels: 'R/G/B/D' → 'Ch0 (R)/Ch1 (G)/Ch2 (B)/Ch3 (D)'
- Add 'Layer' prefix in weights table for consistency
- Document layer indexing: Static + Layer 1,2,3... (UI) ↔ weights.layers[0,1,2...]
- Add explanatory notes about 7D input and 4-of-8 channel display
- Create doc/CNN_V2_BINARY_FORMAT.md with complete .bin specification
- Cross-reference spec in CNN_V2.md and CNN_V2_WEB_TOOL.md

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 24 insertions, 21 deletions

diff --git a/doc/CNN_V2_WEB_TOOL.md b/doc/CNN_V2_WEB_TOOL.md
index 2fbc70e..81549ab 100644
--- a/doc/CNN_V2_WEB_TOOL.md
+++ b/doc/CNN_V2_WEB_TOOL.md
@@ -49,9 +49,11 @@ Browser-based WebGPU tool for validating CNN v2 inference with layer visualizati
 **3. Visualization Modes**
 
 **Activations Mode:**
-- 4 grayscale views per layer (channels 0-3)
+- 4 grayscale views per layer (channels 0-3 of up to 8 total)
 - WebGPU compute → unpack f16 → scale → grayscale
-- Auto-scale: Layer 0 (static) = 1.0, CNN layers = 0.2
+- Auto-scale: Static features = 1.0, CNN layers = 0.2
+- Static features: Shows R,G,B,D (first 4 of 8: RGBD+UV+sin+bias)
+- CNN layers: Shows first 4 output channels
 
 **Weights Mode:**
 - 2D canvas rendering per output channel
@@ -78,6 +80,21 @@ For each CNN layer i:
   Compute (ping-pong) → copy to layerTextures[i+1]
 ```
 
+### Layer Indexing
+
+**UI Layer Buttons:**
+- "Static" → layerOutputs[0] (7D input features)
+- "Layer 1" → layerOutputs[1] (CNN layer 1 output, uses weights.layers[0])
+- "Layer 2" → layerOutputs[2] (CNN layer 2 output, uses weights.layers[1])
+- "Layer N" → layerOutputs[N] (CNN layer N output, uses weights.layers[N-1])
+
+**Weights Table:**
+- "Layer 1" → weights.layers[0] (first CNN layer weights)
+- "Layer 2" → weights.layers[1] (second CNN layer weights)
+- "Layer N" → weights.layers[N-1]
+
+**Consistency:** Both UI and weights table use same numbering (1, 2, 3...) for CNN layers.
+
 ---
 
 ## Known Issues
@@ -192,26 +209,12 @@ For each CNN layer i:
 
 ## Binary Weight Format
 
-**Header (16 bytes):**
-```
-u32 magic;        // 0x32_4E_4E_43 ("CNN2")
-u32 version;      // Format version
-u32 num_layers;   // Layer count
-u32 total_weights;// Total f16 weight count
-```
-
-**Layer Info (20 bytes × N):**
-```
-u32 kernel_size;   // 3, 5, 7, etc.
-u32 in_channels;   // Input channel count
-u32 out_channels;  // Output channel count
-u32 weight_offset; // Offset in f16 units
-u32 weight_count;  // Number of f16 weights
-```
+See `doc/CNN_V2_BINARY_FORMAT.md` for complete specification.
 
-**Weights (variable):**
-- Packed f16 pairs as u32 (lo 16 bits, hi 16 bits)
-- Sequential storage: [layer0_weights][layer1_weights]...
+**Quick Summary:**
+- Header: 16 bytes (magic, version, layer count, total weights)
+- Layer info: 20 bytes × N (kernel size, channels, offsets)
+- Weights: Packed f16 pairs as u32
 
 ---