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benchmarks/archive/README.md

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+# benchmarks/archive/
+
+Long-term archival folder for launch-claim-supporting benchmark runs.
+
+## Retention contract (per H-AUDIT-1 ratification §Q5)
+
+- **Tier 2 only.** This folder holds gzipped JSONL from runs that support a
+  published LoCoMo or SWE-ContextBench claim (e.g. H-42a/b Stage 2 full-run
+  when it lands). Sprint-internal probes (Stage 1 mikro-eval, Stage 2 4-cell
+  mini, reruns) stay in `benchmarks/results/` and are pruned at sprint close.
+- **12 months minimum** from commit date. Longer at PM discretion for
+  EU AI Act / legal / compliance alignment.
+- **Gzipped JSONL only.** Expected ≤300MB per full run (~20-30% of raw).
+- **Includes `reasoning_content`** when Stage 2 thinking=on runs land here —
+  external reviewers asking "why did the model answer this way on item N"
+  need the provider's reasoning chain. Exclusion rules (§2.4 of design doc)
+  apply to the read path, not to the archive write path.
+
+## Naming
+
+```
+h-42a-stage-2-full-YYYY-MM-DD.jsonl.gz   # Stage 2 main-run artifact
+h-42b-stage-2-full-YYYY-MM-DD.jsonl.gz   # Comparative run (if cut)
+```
+
+## NOT gitignored
+
+Both the folder and its contents ARE committed — see `.gitignore` exemption
+rule (Sprint 11 A2).
+
+## Sprint 11 state
+
+Empty. Sprint 11 only provisions the folder. Real archival files land in the
+sprint that executes H-42a/b.