feat(corpus): lock the ShareX TcpListener + StreamReader leaks as regressions (recall 10→12) #352

Job	Run time
lint (ruff + mypy --strict)	10s
golden C# compiles & runs (.NET)	23s
extended codegen fuzz	35s
own-check repo scan (github + msbuild) + composite action	33s
tests (py3.11)	6s
corpus benchmark (real C# recall + specificity)	1m 42s
tests (py3.13)	8s
tests (py3.12)	7s
C# leak extractor (Roslyn) -> OwnIR -> core	31s
own-check SARIF -> GitHub code scanning (dog-food)	24s
	4m 39s

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