docs(runtime): give the retention witness its section, and take back the comment that outlived its method #1801

Job	Run time
P-014 Tier B — external reference resolution (--ref-dir)	38s
OwnTS (React useEffect) -> OwnIR -> core	11s
rust (fmt + clippy + tests)	21s
release-workflow environment-protection predicate (fixture-driven)	6s
C# leak extractor (Roslyn) -> OwnIR -> core	6m 45s
lint (ruff + mypy --strict)	13s
golden C# compiles & runs (.NET)	24s
audit aggregation selftests	8s
extended codegen fuzz	35s
own-check.ps1 exit-code tiers (Windows)	1m 36s
OwnTS OSS true positives -> runtime leak proof (jsdom)	13s
tests (py3.11)	37s
own-check repo scan (github + msbuild) + composite action	1m 14s
own-check SARIF -> GitHub code scanning (dog-food)	38s
owen CLI (gate A) — clean install -> check -> findings (ubuntu-latest)	1m 6s
tests (py3.13)	40s
owen CLI (gate A) — clean install -> check -> findings (windows-latest)	3m 32s
tests (py3.12)	35s
corpus benchmark (real C# recall + specificity)	4m 15s
	23m 47s

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