Study 09 data: add two rat transfer cohorts

Child of #134. Draft implementation: #139.

## Stage-A outcome

- [x] Alsiö cohorts II–V: complete 95-rat, 2,334-session cohort admitted as v1.
- [x] Alsiö cohort VI PRL: skipped because chronological real-session identity cannot be reconstructed without a new split rule.
- [x] Miller: complete 20-rat, 1,857-session cohort admitted as v1.
- [x] Release identities, CC BY 4.0 terms, checksums, exact inclusion audits, and source metadata are committed.
- [x] Canonical adapters preserve subject/session/trial and available cohort/task metadata.
- [x] Deterministic split manifests and regression tests pass.
- [x] Common-Q and author-model feasibility are documented; no new author model is implemented in Stage A.
- [x] Both D=614 seed-0 GPU smokes passed.
- [x] Full GRU matrices and common-Q fits completed and were frozen with exact ordered held-out trial-key parity.
- [x] Results and representative sessions are included in the Stage-A decision report.

The data-ingestion and Stage-A execution scope is complete and in review.

The issue names no files, tests, or entry points. Start by reviewing child issue #134 and draft implementation #139, then use the Stage-A decision report, regression-test results, and exact inclusion audits to determine what remains; the stated data-ingestion and execution scope is already complete and in review.

Escrita pelo modelo de indexação a partir do texto da issue.