docs: field-note ledger for the post-D5.4-step-2 Polly oracle re-run #863

Job	Run time
audit aggregation selftests	9s
extended codegen fuzz	38s
C# leak extractor (Roslyn) -> OwnIR -> core	50s
golden C# compiles & runs (.NET)	22s
lint (ruff + mypy --strict)	16s
tests (py3.12)	10s
own-check repo scan (github + msbuild) + composite action	48s
own-check SARIF -> GitHub code scanning (dog-food)	28s
tests (py3.11)	8s
tests (py3.13)	10s
corpus benchmark (real C# recall + specificity)	2m 52s
P-014 Tier B — external reference resolution (--ref-dir)	36s
	7m 27s

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