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fix: reject unsupported pool expansion with actionable errors (#7360)

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* fix: reject unsupported pool expansion with actionable errors

Report singleton-pool and persisted-topology constraints before misleading startup retries. Preserve single-node multi-drive admission and existing parity policies, and cover format preservation plus operator recovery guidance for issue #6186.

* fix: keep pool layout errors typed

Preserve actionable pool layout diagnostics without adding generic formatted errors. Tighten the shrink-only baseline and assert that both typed payloads survive the I/O boundary.

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Co-authored-by: houseme <housemecn@gmail.com>
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cxymds
2026-09-07 19:07:42 +08:00
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parent 4c2a0cdf9a
commit 37bda24e1c
11 changed files with 677 additions and 28 deletions
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docs/testing/README.md
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@@ -25,6 +25,8 @@ The [scanner checkpoint fixture](scanner-checkpoint-fixture.md) diagnoses retain
The [scanner cache cost profile](scanner-cache-cost.md) separates clone, subtree copy, encoding, and counted save costs without changing production cache behavior.
The [Pool layout compatibility reference](pool-layout-compatibility.md) defines the topology and EC regression matrix for single-drive, single-node multi-drive, and multi-node expansion pools.
## Naming conventions
### Reserved test-name substrings (migration gate)