Rework `Vt` into `Engine`

- Moves as much data out of the `Vm`
- Removes duplication with call_vm and call_vt flavours
- Uses tracked chain instead of fixed int for determining max nesting depth
- This means that nesting checks now generalizes to layout and realization, to detect crashing show rules and overly nested layouts

1 files changed, 0 insertions, 0 deletions

diff --git a/tests/ref/compute/eval-path.png b/tests/ref/compute/eval-path.png
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index 00000000..c59dd2aa
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+++ b/tests/ref/compute/eval-path.png