Checkpoint experiments through SWE pilot v2

docs/research/README.md

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+# Supporting design research
+
+The current specification is [EXPERIMENT.md](../../EXPERIMENT.md). These two notes
+are frozen historical design discussions, preserved with their original wording
+and links; they may refer to superseded plans and original locations.
+
+- [Shared-directory design](09-shared-scratch-design.md): lessons from the earlier
+  scratchpad setup.
+- [Private scratch and explicit board](10-private-scratch-public-board.md): design
+  rationale for the current separation of private files and public messages.
+- `sources/team-scratch/`: archived DeepMind case study and source metadata.
+- `sources/board-design-sept7/`: model/provider facts used during pilot setup.
+
+Broader literature dumps and personal notes were not imported. They remain in the
+retired archive. See [migration details](../migration/README.md) for path mappings.