feat(portable): surface cause of any fatal driver-thread signal (#691) #181

Job	Run time
cargo check / test (workspace)	3m 43s
pie-server (driver-portable)	4m 4s
pie-server (driver-portable + metal)	5m 15s
pie-server (driver-dummy) (ubuntu-latest)	2m 52s
pie-server (driver-dummy) (macos-latest)	2m 32s
pie-server (driver-cuda)	0s
	18m 26s

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