refactor(cnn): rename cnn_effect to cnn_v1_effect for clarity

Renamed files and classes:
- cnn_effect.{h,cc} → cnn_v1_effect.{h,cc}
- CNNEffect → CNNv1Effect
- CNNEffectParams → CNNv1EffectParams
- CNNLayerParams → CNNv1LayerParams
- CNN_EFFECT.md → CNN_V1_EFFECT.md

Updated all references:
- C++ includes and class usage
- CMake source list
- Timeline (workspaces/main/timeline.seq)
- Test file (test_demo_effects.cc)
- Documentation (CLAUDE.md, PROJECT_CONTEXT.md, READMEs)

Tests: 34/34 passing (100%)

3 files changed, 4 insertions, 4 deletions

diff --git a/src/app/test_demo.cc b/src/app/test_demo.cc
index f512a5f..ff2c105 100644
--- a/src/app/test_demo.cc
+++ b/src/app/test_demo.cc
@@ -20,7 +20,7 @@ extern float GetDemoDuration();
 extern void LoadTimeline(MainSequence& main_seq, const GpuContext& ctx);
 
 // Inline peak meter effect for debugging audio-visual sync
-#include "effects/cnn_effect.h"
+#include "../../cnn_v1/src/cnn_v1_effect.h"
 #include "../../cnn_v2/src/cnn_v2_effect.h"
 #include "gpu/post_process_helper.h"
 #include "gpu/shader_composer.h"
diff --git a/src/gpu/demo_effects.h b/src/gpu/demo_effects.h
index 60ca581..6b22f3f 100644
--- a/src/gpu/demo_effects.h
+++ b/src/gpu/demo_effects.h
@@ -18,7 +18,7 @@
 // Individual Effect Headers
 #include "effects/chroma_aberration_effect.h"
 #include "effects/circle_mask_effect.h"
-#include "effects/cnn_effect.h"
+#include "../../cnn_v1/src/cnn_v1_effect.h"
 #include "../../cnn_v2/src/cnn_v2_effect.h"
 #include "effects/distort_effect.h"
 #include "effects/fade_effect.h"
diff --git a/src/tests/gpu/test_demo_effects.cc b/src/tests/gpu/test_demo_effects.cc
index ec78c10..8726e55 100644
--- a/src/tests/gpu/test_demo_effects.cc
+++ b/src/tests/gpu/test_demo_effects.cc
@@ -12,7 +12,7 @@
 
 #include "../common/effect_test_helpers.h"
 #include "../common/webgpu_test_fixture.h"
-#include "effects/cnn_effect.h"
+#include "../../../cnn_v1/src/cnn_v1_effect.h"
 #include "gpu/demo_effects.h"
 #include "gpu/effect.h"
 #include <cassert>
@@ -89,7 +89,7 @@ static void test_post_process_effects() {
       {"ThemeModulationEffect",
        std::make_shared<ThemeModulationEffect>(fixture.ctx())},
       {"VignetteEffect", std::make_shared<VignetteEffect>(fixture.ctx())},
-      {"CNNEffect", std::make_shared<CNNEffect>(fixture.ctx())},
+      {"CNNv1Effect", std::make_shared<CNNv1Effect>(fixture.ctx())},
       {"CNNv2Effect", std::make_shared<CNNv2Effect>(fixture.ctx())},
   };