catalog: finalize memory and RAG upstream stack recommendations - #828

### Scope

Qualifies #828's current memory/RAG catalog as proposed source-review input and adds a dated provenance amendment. The original review observations, decided text, eighteen repository pins/dispositions and five profile memberships are preserved.

- Base commit: `c9e3597b176c247585392aa22cc23dbb748a3441`
- Head: `663702741d8019cc9b091735f2ff7fbfccb7c706`
- Lane: `lane:foundation`
- Owned paths: the memory/RAG catalog, catalog README, appended decision amendment, two new qualification artifacts and their evidence-registry bindings.
- Landing path: co-op exact-head read of findings F1–F3 → command-center ACK with CI at that head → the command center's queue, landed by 5f. This is the explicitly assigned #828 follow-up, exempt from the lane's two-unit cap; it stays draft until that read.

Exactly three findings addressed:

1. **F1 (P2):** explicit proposed status, recommendation-only responsibilities, no host memory-owner selection and no preselected memory-h2h winner. The current carriers are edited; the old decision is qualified by an appended dated amendment.
2. **F2 (P2):** the historical PageIndex benchmark revision remains unrecovered. A new dated check pins the separate benchmark README, labels its counts and exclusions as vendor descriptions and makes all eighteen inspected component locators direct in the amendment.
3. **F3 (P3):** installation and client smoke are explicitly not performed in this review; organic use is not observed. “Tested” evaluation wording names the upstream CI actor.

### SOTA sources

- [Original source review and catalog at the landed #828 commit](https://github.com/seathatflowsinourveins/native-agent-stack/tree/18150f10b061ca3fb74a63cdb783dbaaf31c4057/evidence/artifacts/memory-rag-stacks-20261007), including its eighteen immutable primary-source locators. This follow-up preserves that record and its failure observations.
- [VectifyAI/PageIndex-OSS-Benchmark@ad4c0b9:README.md](https://github.com/VectifyAI/PageIndex-OSS-Benchmark/blob/ad4c0b92970a6f4801f09ff2e647389e8f5874fa/README.md#L6-L15), with [the count inventory](https://github.com/VectifyAI/PageIndex-OSS-Benchmark/blob/ad4c0b92970a6f4801f09ff2e647389e8f5874fa/README.md#L22-L23). This new check is not a recovered historical pin or an executed benchmark.
- [Repository evidence policy@c9e3597b176c247585392aa22cc23dbb748a3441:docs/acceptance-evidence-policy.md](https://github.com/seathatflowsinourveins/native-agent-stack/blob/c9e3597b176c247585392aa22cc23dbb748a3441/docs/acceptance-evidence-policy.md#L24-L40) and [hot-file protocol](https://github.com/seathatflowsinourveins/native-agent-stack/blob/c9e3597b176c247585392aa22cc23dbb748a3441/docs/lanes.md#L94-L141): source review, native acceptance and structural validation remain separate; registry committed last.

### Evidence-class table

| Claim | Evidence class | Command / receipt |
| --- | --- | --- |
| Proposed-status and actor qualifications | source_review | Current catalog plus appended decision amendment |
| Newly pinned PageIndex benchmark description | source_review; vendor claim | New `source-qualification.json`; pinned README above |
| Historical bytes, eighteen pins/dispositions and five memberships preserved | structural_validation | Exact base/head byte and parsed-signature comparisons |
| Typed index and registered file consistency | structural_validation | `catalog_decisions.py --write`, `validate.py` |
| Catalog parser contracts | synthetic fixture; structural_validation | Existing `tests.test_catalog_decisions`: 14 tests, exit 0 |
| Installation, native-client smoke, organic use and model/benchmark runs | not performed in this review | Explicit qualification states |

### Local commands run

```
python3 scripts/catalog_decisions.py --write
exit 0; identity union and typed pointers validated; generated index unchanged

python3 -c 'import sys; from pathlib import Path; sys.path.insert(0, "scripts"); import host_receipts
for p in sys.argv[1:]: host_receipts.register_file(Path("."), p)' <five owned files>
exit 0

python3 -m unittest tests.test_catalog_decisions
exit 0; 14 tests passed

python3 scripts/validate.py
exit 0; status passed, 10,490 hashed files

git diff --check
exit 0
```

Commands ran with nice 19 and idle I/O; test scratch and logs are durable private lane state. The registry is the last commit. No rebase was performed.

### Decision record

`docs/decisions/2026-10-07-memory-rag-source-stacks.md`, appended **Amendment (2026-10-07)**. The separately owned memory-h2h result is added as an explicit possible overturn source; this PR makes no new selection.

### Host evidence

No host receipt or deployed configuration is changed.

### Checklist

- [x] No workflows, dependency locks or installation commands changed.
- [x] No credentials, raw conversations or private host paths committed.
- [x] No new paid hosting or billing surface introduced.
- [x] Peer-owned worktrees and untracked files preserved.
- [x] Exactly F1, F2 and F3 addressed; source review is not promoted into adoption.