Per-command timings for script runs and batches (#1868)

Thanks @DuBearte.

crates/kernel/Cargo.toml

@@ -20,6 +20,7 @@ truck-meshalgo = { workspace = true }
 truck-stepio = { workspace = true }
 truck-topology = { workspace = true }
 spade = { workspace = true }
+web-time = { workspace = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 rayon = { workspace = true }