Phase 24: add mix buses, coherent peak meters and master clipping indicators

tests/fixtures/README.md

@@ -3,7 +3,7 @@
 Store small, redistributable fixtures here. Document their origin and license.
 Do not commit large recordings or assets with unclear licensing.
 
-`project-v1.xtc` through `project-v7.xtc` are hand-authored xtc metadata fixtures
+`project-v1.xtc` through `project-v8.xtc` are hand-authored xtc metadata fixtures
 created for this repository, under the project license. They contain no audio
 or third-party resources. The v5/v6 plugin fixtures intentionally reference a
 missing module to exercise metadata migration without loading code.

tests/fixtures/project-v8.xtc

@@ -0,0 +1,21 @@
+XTC_PROJECT 8
+APP 0 1 0
+TEMPO 120000
+IDS 1 1
+GRAPH 1 2 2 1
+NODE 0 1 3f000000
+NODE 1 4 00000000
+EDGE 0 1
+TRACKS 1
+TRACK 0 4b657973
+MIX 3f800000 00000000 0 0
+CLIPS 1
+CLIP 0 0 0 960 0 960 5665727365
+ASSET -
+MIDI 1
+AUDIO 3f800000 0 0
+NOTES 1 1
+NOTE 0 0 0 480 69 100 0
+AUTOMATION 1
+POINT 0 0 0 3f800000
+END