fix(ci): pin submodule to SDK v0.6.0, enable submodule checkout, form… #7

Job	Run time
gates / validate lang	9s
gates / .NET CI / Format check	49s
gates / .NET CI / Build	54s
gates / Security / CodeQL (csharp)	2m 55s
gates / Rust CI	0s
gates / Security / osv-scanner	1m 50s
gates / Security / actionlint	10s
gates / C++ CI	0s
gates / Security / zizmor	31s
gates / Security / gitleaks	0s
gates / Python CI	0s
gates / Node CI	0s
gates / Security / dependency-review	0s
gates / Security / semgrep	0s
gates / Security / snyk	0s
gates / .NET CI / Test	1m 2s
gates / required	11s
required	2s
	8m 33s

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