Sonata has the stack high-water mark register.

For some reason, this was not enabled in the Sonata board config.
Enabling it improves the test suite performance by around 5%.

sdk/boards/sonata.json

diff --git a/sdk/boards/sonata.json b/sdk/boards/sonata.json
index 7d8433a..9fdccd6 100644
--- a/sdk/boards/sonata.json
+++ b/sdk/boards/sonata.json
@@ -50,6 +50,7 @@
     "timer_hz" : 30000000,
     "tickrate_hz" : 100,
     "revoker" : "software",
+    "stack_high_water_mark" : true,
     "simulator" : "${sdk}/../scripts/run-sonata.sh",
     "simulation": false
 }