docs: 双 README 重复徽章行去重

[modusensus]

9-24 的合并提交 37e77f1（解 #275 车道与 main 的冲突）把 tests 徽章行与中英 npm test 命令注释各复制了一份——根 README 三处（徽章 + 两个语言段的命令注释）、包内 README 两处。

badge:sync 的全文正则替换只会把重复行一起刷新成新数字、永不自愈，故一直留存至今。本 PR 手工去重（各留一行），CHANGELOG [Unreleased] 🧹 小节登记。纯文档改动，零代码影响。

Summary by CodeRabbit

• 文档
  • 清理中英文 README 中重复的测试数量徽章及开发命令示例中的测试相关内容，每项仅保留一处或不再展示。
  • 在更新日志中记录此次去重，并说明徽章同步操作不会自动移除重复内容。

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: slow-stack/mneme/.coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: c3373e88-57b1-48fb-b690-e6af2e3737d6

📥 Commits

Reviewing files that changed from the base of the PR and between 6c5adc0 and 7ee7d36.

📒 Files selected for processing (3)

• README.md
• dsh-mneme/CHANGELOG.md
• dsh-mneme/README.md

💤 Files with no reviewable changes (2)

• README.md
• dsh-mneme/README.md

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review.

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📝 Walkthrough

Walkthrough

根 README 和包内 README 删除了重复的测试徽章、测试数量说明或测试命令。变更日志记录了此次清理，并说明 badge:sync 不会自动删除重复行。

Changes

README 测试信息去重

Layer / File(s)	Summary
清理 README 测试信息 README.md, dsh-mneme/README.md, dsh-mneme/CHANGELOG.md	根 README 删除首页测试徽章及中英文开发命令中的测试数量说明。包内 README 删除重复徽章和开发命令中的 npm test 行。变更日志记录了去重情况，并说明 badge:sync 不会自动删除重复行。

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Other

Suggested reviewers: heptaspirit

Merge Risk: ⚪ Minimal · up to 7ee7d

这项文档清理未显示会影响测试或其他工作流程的风险，可以合并。

Architecture Summary

Architecture risk: 🔵 Low · up to 7ee7d

The change affects 2 systems.

Changed systems: dsh-mneme, README.md

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — dsh-mneme (service) was modified; 2 changed files map to changed impact.
• observed — README.md (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in README.md: 移除了首页的测试数量徽章。
• observed — Modified behavior in README.md: 移除了本地开发命令中 npm test 后的测试数量注释。
• observed — Modified behavior in README.md: 移除了英文本地开发命令中 npm test 后的测试数量注释。
• observed — Modified behavior in dsh-mneme/CHANGELOG.md: 在未发布版本的「清理」部分新增 README 去重记录，列明根 README 三处及包内 README 两处重复的 tests 徽章与 npm test 注释已各留一行；原有文字指出 badge:sync 的全文替换不会自行去重。

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了根 README 和包内 README 的重复徽章去重变更，与 PR 的主要目标一致。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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