feat(launcher): opt-in Rust engine behind the existing launcher (#262 Stage 1) #1921

Job	Run time
rust (fmt + clippy + tests)	39s
owen --engine (#262 Stage 1 controls) (windows-latest)	3m 58s
C# leak extractor (Roslyn) -> OwnIR -> core	6m 53s
golden C# compiles & runs (.NET)	20s
audit aggregation selftests	9s
owen CLI (gate A) — clean install -> check -> findings (windows-latest)	2m 32s
owen CLI (gate A) — clean install -> check -> findings (ubuntu-latest)	1m 4s
own-check SARIF -> GitHub code scanning (dog-food)	40s
lint (ruff + mypy --strict)	13s
tests (py3.11)	1m 28s
tests (py3.12)	1m 38s
own-check.ps1 mutation campaign (Windows-native)	2m 25s
own-cli (ownir parity replay) (ubuntu-latest)	23s
tests (py3.13)	1m 24s
own-check repo scan (github + msbuild) + composite action	1m 6s
extended codegen fuzz	38s
OwnTS OSS true positives -> runtime leak proof (jsdom)	9s
owen --engine (#262 Stage 1 controls) (ubuntu-latest)	2m 3s
shadow compare (committed corpus)	42s
own-cli (ownir parity replay) (windows-latest)	55s
P-014 Tier B — external reference resolution (--ref-dir)	38s
release-workflow environment-protection predicate (fixture-driven)	5s
corpus benchmark (real C# recall + specificity)	6m 1s
OwnTS (React useEffect) -> OwnIR -> core	12s
own-check.ps1 exit-code tiers (Windows)	2m 0s
shadow compare (C# samples)	42s
	38m 57s

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