Box JSException storage in a class to fit the direct typed-error convention #98

Job	Run time
build-examples	18m 54s
prettier	12s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	2m 29s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 14s
format	32s
check-bridgejs-generated	2m 48s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	5m 19s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	5m 19s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 10s
Build for native target (macos-15, Xcode_16.4)	2m 52s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	5m 18s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 5s
deploy-examples	1s
	53m 13s

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