archive(cnn): move CNN v1 to cnn_v1/ subdirectory

Consolidate CNN v1 (CNNEffect) into dedicated directory:
- C++ effect: src/effects → cnn_v1/src/
- Shaders: workspaces/main/shaders/cnn → cnn_v1/shaders/
- Training: training/train_cnn.py → cnn_v1/training/
- Docs: doc/CNN*.md → cnn_v1/docs/

Updated all references:
- CMake source list
- C++ includes (relative paths: ../../cnn_v1/src/)
- Asset paths (../../cnn_v1/shaders/)
- Documentation cross-references

CNN v1 remains active in timeline. For new work, use CNN v2 with
enhanced features (7D static, storage buffer, sigmoid activation).

Tests: 34/34 passing (100%)

1 files changed, 0 insertions, 101 deletions

diff --git a/workspaces/main/shaders/cnn/cnn_conv5x5.wgsl b/workspaces/main/shaders/cnn/cnn_conv5x5.wgsl
deleted file mode 100644
index 9328d75..0000000
--- a/workspaces/main/shaders/cnn/cnn_conv5x5.wgsl
+++ /dev/null
@@ -1,101 +0,0 @@
-// 5×5 variant for 7→4 channels (vec4-optimized)
-// Assumes 'tex' is already normalized to [-1,1]
-// UV coordinates remain in [0,1] and are normalized internally
-// weights: array<vec4<f32>, 200> (25 pos × 4 ch × 2 vec4)
-fn cnn_conv5x5_7to4(
-  tex: texture_2d<f32>,
-  samp: sampler,
-  uv: vec2<f32>,
-  resolution: vec2<f32>,
-  gray: f32,
-  weights: array<vec4<f32>, 200>
-) -> vec4<f32> {
-  let step = 1.0 / resolution;
-  let uv_norm = (uv - 0.5) * 2.0;
-  let in1 = vec4<f32>(uv_norm, gray, 1.0);
-
-  var sum = vec4<f32>(0.0);
-  var pos = 0;
-
-  for (var dy = -2; dy <= 2; dy++) {
-    for (var dx = -2; dx <= 2; dx++) {
-      let offset = vec2<f32>(f32(dx), f32(dy)) * step;
-      let rgbd = textureSample(tex, samp, uv + offset);
-
-      sum.r += dot(weights[pos+0], rgbd) + dot(weights[pos+1], in1);
-      sum.g += dot(weights[pos+2], rgbd) + dot(weights[pos+3], in1);
-      sum.b += dot(weights[pos+4], rgbd) + dot(weights[pos+5], in1);
-      sum.a += dot(weights[pos+6], rgbd) + dot(weights[pos+7], in1);
-      pos += 8;
-    }
-  }
-
-  return sum;
-}
-
-// 5×5 variant for 7→1 channel (vec4-optimized)
-// Assumes 'tex' is already normalized to [-1,1]
-// UV coordinates remain in [0,1] and are normalized internally
-// weights: array<vec4<f32>, 50> (25 pos × 2 vec4)
-fn cnn_conv5x5_7to1(
-  tex: texture_2d<f32>,
-  samp: sampler,
-  uv: vec2<f32>,
-  resolution: vec2<f32>,
-  gray: f32,
-  weights: array<vec4<f32>, 50>
-) -> f32 {
-  let step = 1.0 / resolution;
-  let uv_norm = (uv - 0.5) * 2.0;
-  let in1 = vec4<f32>(uv_norm, gray, 1.0);
-
-  var sum = 0.0;
-  var pos = 0;
-
-  for (var dy = -2; dy <= 2; dy++) {
-    for (var dx = -2; dx <= 2; dx++) {
-      let offset = vec2<f32>(f32(dx), f32(dy)) * step;
-      let rgbd = textureSample(tex, samp, uv + offset);
-
-      sum += dot(weights[pos], rgbd) + dot(weights[pos+1], in1);
-      pos += 2;
-    }
-  }
-
-  return sum;
-}
-
-// Source layer: 7→4 channels (vec4-optimized)
-// Normalizes [0,1] input to [-1,1] internally
-fn cnn_conv5x5_7to4_src(
-  tex: texture_2d<f32>,
-  samp: sampler,
-  uv: vec2<f32>,
-  resolution: vec2<f32>,
-  weights: array<vec4<f32>, 200>
-) -> vec4<f32> {
-  let step = 1.0 / resolution;
-
-  let original = (textureSample(tex, samp, uv) - 0.5) * 2.0;
-  let gray = dot(original.rgb, vec3<f32>(0.2126, 0.7152, 0.0722));
-  let uv_norm = (uv - 0.5) * 2.0;
-  let in1 = vec4<f32>(uv_norm, gray, 1.0);
-
-  var sum = vec4<f32>(0.0);
-  var pos = 0;
-
-  for (var dy = -2; dy <= 2; dy++) {
-    for (var dx = -2; dx <= 2; dx++) {
-      let offset = vec2<f32>(f32(dx), f32(dy)) * step;
-      let rgbd = (textureSample(tex, samp, uv + offset) - 0.5) * 2.0;
-
-      sum.r += dot(weights[pos+0], rgbd) + dot(weights[pos+1], in1);
-      sum.g += dot(weights[pos+2], rgbd) + dot(weights[pos+3], in1);
-      sum.b += dot(weights[pos+4], rgbd) + dot(weights[pos+5], in1);
-      sum.a += dot(weights[pos+6], rgbd) + dot(weights[pos+7], in1);
-      pos += 8;
-    }
-  }
-
-  return sum;
-}