limit shard count min/max

[codecov-commenter]

Codecov Report

Patch coverage: 57.14% and project coverage change: -0.67 :warning:

Comparison is base (5c9efba) 96.04% compared to head (f6c1e74) 95.38%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #9 +/- ## ========================================== - Coverage 96.04% 95.38% -0.67% ========================================== Files 12 12 Lines 1163 1169 +6 ========================================== - Hits 1117 1115 -2 - Misses 32 37 +5 - Partials 14 17 +3 ``` | [Impacted Files](https://codecov.io/gh/Yiling-J/theine-go/pull/9?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yiling-J) | Coverage Δ | | |---|---|---| | [internal/store.go](https://codecov.io/gh/Yiling-J/theine-go/pull/9?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yiling-J#diff-aW50ZXJuYWwvc3RvcmUuZ28=) | `97.60% <57.14%> (-0.78%)` | :arrow_down: | ... and [1 file with indirect coverage changes](https://codecov.io/gh/Yiling-J/theine-go/pull/9/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Yiling-J)

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