docs: replace the single-node report with the maintained migration entry point

Keep the original PR #228 report at a fixed commit link with contributor credit. Direct operators to the bilingual migration guide and its recovery requirements, and record the merged contribution.

Signed-off-by: Feng Ruohang <rh@vonng.com>

CONTRIBUTORS.md

@@ -23,7 +23,7 @@ When a proposal was incorporated through a later repair, its adoption is credite
 <a href="https://github.com/julienlau"><img src="https://silo.pgsty.com/images/contributors/julienlau.svg" width="60" height="60" alt="@julienlau" title="@julienlau — Fixed missing-commit-metadata error handling and stale metadata reuse; contributed replication reports and proposals"></a>
 <a href="https://github.com/Aeirx"><img src="https://silo.pgsty.com/images/contributors/Aeirx.svg" width="60" height="60" alt="@Aeirx" title="@Aeirx — Preserved Object Lock legal-hold headers in federated CopyObject"></a>
 <a href="https://github.com/AleksaMCode"><img src="https://silo.pgsty.com/images/contributors/AleksaMCode.svg" width="60" height="60" alt="@AleksaMCode" title="@AleksaMCode — Fixed the Lambda target-set emptiness check and added a regression test"></a>
-<a href="https://github.com/yupoet"><img src="https://silo.pgsty.com/images/contributors/yupoet.svg" width="60" height="60" alt="@yupoet" title="@yupoet — Improved checksum mismatch messages, verified erasure-coding documentation, and proposed an upgrade guide"></a>
+<a href="https://github.com/yupoet"><img src="https://silo.pgsty.com/images/contributors/yupoet.svg" width="60" height="60" alt="@yupoet" title="@yupoet — Improved checksum mismatch messages, verified erasure-coding documentation, and contributed a single-node migration case"></a>
 <a href="https://github.com/clown15"><img src="https://silo.pgsty.com/images/contributors/clown15.svg" width="60" height="60" alt="@clown15" title="@clown15 — Fixed native multipart-upload timestamp parsing during stale-upload cleanup"></a>
 <a href="https://github.com/botdeniska"><img src="https://silo.pgsty.com/images/contributors/botdeniska.svg" width="60" height="60" alt="@botdeniska" title="@botdeniska — Contributed multi-pool migration safety repairs and faster policy evaluation in silo-pkg"></a>
 <a href="https://github.com/magicxor"><img src="https://silo.pgsty.com/images/contributors/magicxor.svg" width="60" height="60" alt="@magicxor" title="@magicxor — Reported and proposed conditional DELETE support for If-Match"></a>
@@ -92,7 +92,7 @@ When a proposal was incorporated through a later repair, its adoption is credite
 | [@julienlau](https://github.com/julienlau) | Fixed missing-commit-metadata error handling and stale metadata reuse; contributed replication reports and proposals | Merged PRs: [pgsty/silo#232](https://github.com/pgsty/silo/pull/232), [pgsty/silo#233](https://github.com/pgsty/silo/pull/233)<br>Open PRs: [pgsty/silo#240](https://github.com/pgsty/silo/pull/240), [pgsty/silo#241](https://github.com/pgsty/silo/pull/241)<br>PRs closed without merging: [pgsty/silo#184](https://github.com/pgsty/silo/pull/184)<br>Closed issues: [pgsty/silo#152](https://github.com/pgsty/silo/issues/152), [pgsty/silo#153](https://github.com/pgsty/silo/issues/153)<br>The original PR was not merged directly. Its purge-state and recovery analysis, proposed fix, tests, and documentation helped shape [#196](https://github.com/pgsty/silo/pull/196); see the [maintainer acknowledgement](https://github.com/pgsty/silo/pull/184#issuecomment-5689295222). |
 | [@Aeirx](https://github.com/Aeirx) | Preserved Object Lock legal-hold headers in federated CopyObject | Merged PRs: [pgsty/silo#172](https://github.com/pgsty/silo/pull/172) |
 | [@AleksaMCode](https://github.com/AleksaMCode) | Fixed the Lambda target-set emptiness check and added a regression test | Merged PRs: [pgsty/silo#220](https://github.com/pgsty/silo/pull/220) |
-| [@yupoet](https://github.com/yupoet) | Improved checksum mismatch messages, verified erasure-coding documentation, and proposed an upgrade guide | Merged PRs: [pgsty/silo#229](https://github.com/pgsty/silo/pull/229)<br>Open PRs: [pgsty/silo#228](https://github.com/pgsty/silo/pull/228), [pgsty/silo#230](https://github.com/pgsty/silo/pull/230)<br>Also [cross-checked the two-drive EC:1 documentation](https://github.com/pgsty/silo/issues/197#issuecomment-5846341939). Open upgrade-guide and registry-mirror proposals are credited as proposals, not shipped features. |
+| [@yupoet](https://github.com/yupoet) | Improved checksum mismatch messages, verified erasure-coding documentation, and contributed a single-node migration case | Merged PRs: [pgsty/silo#228](https://github.com/pgsty/silo/pull/228), [pgsty/silo#229](https://github.com/pgsty/silo/pull/229)<br>Open PRs: [pgsty/silo#230](https://github.com/pgsty/silo/pull/230)<br>Also [cross-checked the two-drive EC:1 documentation](https://github.com/pgsty/silo/issues/197#issuecomment-5846341939). The single-node migration report in #228 was merged on 2026-10-23; it records a contributor-reported forward upgrade, not a downgrade guarantee. The registry-mirror proposal remains open. |
 | [@clown15](https://github.com/clown15) | Fixed native multipart-upload timestamp parsing during stale-upload cleanup | Merged PRs: [pgsty/silo#236](https://github.com/pgsty/silo/pull/236) |
 | [@botdeniska](https://github.com/botdeniska) | Contributed multi-pool migration safety repairs and faster policy evaluation in silo-pkg | Open PRs: [pgsty/silo#245](https://github.com/pgsty/silo/pull/245), [pgsty/silo#248](https://github.com/pgsty/silo/pull/248)<br>Merged PRs: [pgsty/silo-pkg#11](https://github.com/pgsty/silo-pkg/pull/11)<br>The migration repair from [#248](https://github.com/pgsty/silo/pull/248) was incorporated in [60c7179dd](https://github.com/pgsty/silo/commit/60c7179ddbfcbd41a1fe67707230f5b360a43020), retaining the original authorship and DCO. The original PR remains open; this does not imply that #245 shipped. |