refactor: Bundle GPU context into GpuContext struct

- Created GpuContext struct {device, queue, format}
- Updated Effect/PostProcessEffect to take const GpuContext&
- Updated all 19 effect implementations
- Updated MainSequence.init() and LoadTimeline() signatures
- Updated generated timeline files
- Updated all test files
- Added gpu_get_context() accessor and fixture.ctx() helper

Fixes test_mesh.cc compilation error from g_device/g_queue/g_format conflicts.
All targets build successfully.

1 files changed, 38 insertions, 0 deletions

diff --git a/peaks_fixed.txt b/peaks_fixed.txt
new file mode 100644
index 0000000..2e111d4
--- /dev/null
+++ b/peaks_fixed.txt
@@ -0,0 +1,38 @@
+# Audio peak log from test_demo
+# Mode: beat-aligned
+# To plot with gnuplot:
+#   gnuplot -p -e "set xlabel 'Time (s)'; set ylabel 'Peak'; plot 'peaks_fixed.txt' using 2:3 with lines title 'Raw Peak'"
+# Columns: beat_number clock_time raw_peak
+#
+0 0.064000 0.588233
+1 0.512000 0.158621
+2 1.024000 0.039656
+3 1.504000 0.074429
+4 2.016000 0.039339
+5 2.528000 0.203162
+6 3.008000 0.039339
+7 3.520000 0.052100
+8 4.000000 0.039339
+9 4.512000 0.785926
+10 5.024000 0.112183
+11 5.504000 0.078633
+12 6.016000 0.039342
+13 6.528000 0.290565
+14 7.008000 0.047940
+15 7.520000 0.074038
+16 8.000000 0.040158
+17 8.512000 0.290565
+18 9.024000 0.033558
+19 9.504000 0.074038
+20 10.016000 0.028111
+21 10.528000 0.203395
+22 11.008000 0.039339
+23 11.520000 0.074038
+24 12.000000 0.040158
+25 12.512000 0.785926
+26 13.024000 0.116352
+27 13.504000 0.078280
+28 14.016000 0.039342
+29 14.528000 0.203162
+30 15.008000 0.039339
+31 15.520000 0.052100