fix(oracle): match .slnx solutions + deepen shallow clone so Infer# can build #131

Job	Run time
own-check repo scan (github + msbuild) + composite action	33s
lint (ruff + mypy --strict)	9s
extended codegen fuzz	34s
golden C# compiles & runs (.NET)	20s
C# leak extractor (Roslyn) -> OwnIR -> core	28s
tests (py3.11)	6s
tests (py3.12)	6s
tests (py3.13)	6s
	2m 22s

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