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xlings: [xlings.workspace] is the one table, deps superseded, envs removed, and the install-time edge published (2026.9.3.1) #1539

Job	Run time
toolchain: gcc (cold self-host)	9m 41s
toolchain: musl + llvm	9m 50s
build + unit tests (linux x86_64, self-host)	15m 41s
integration: mcpp builds & runs xlings	9m 20s
	44m 32s