PRD08 后端工程规范与架构治理：OpenSpec change, PRD, PLAN13

[StephenQiu30]

PR Summary

以 PRD08 为父级需求，创建后端工程规范与架构治理的完整文档体系和 OpenSpec change artifacts。覆盖分层架构定义、shared 真相源、契约优先和测试优先治理要求。

Test-first Evidence

• Red: 本次为 docs-only 变更，无代码行为变更。scripts/validate-repository.sh 在变更前不检查 PRD08 和 PLAN13 文件，添加检查后通过。
• Green: npm test 全部 265 个测试通过，bash scripts/validate-repository.sh 通过。

Tests added

• No new tests applicable — docs-only change, no behavior change
• Existing tests pass: 265/265

Commands run

bash scripts/validate-repository.sh   # 通过
npm test                              # 265 passed

Result

• Before: 无 PRD08、PLAN13 和 backend-engineering-governance OpenSpec change
• After: 完整的文档体系和 OpenSpec artifacts，validate-repository.sh 已更新

Agent Usage

• Human-authored: ticket 描述、验收标准
• Agent-generated: PRD08、PLAN13、OpenSpec proposal/design/specs/tasks、README 更新、validate-repository.sh 更新

Reviewer Checklist

• PRD08 能独立说明后端工程治理边界
• PLAN13 包含架构边界、shared 常量、repository/service 渐进抽取和验证命令
• OpenSpec change artifacts（proposal/specs/design/tasks）完整
• bash scripts/validate-repository.sh 通过
• npm test 全部通过
• 无跨层依赖、无测试重构、无自由错误码

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1d643546-fa3d-45a2-af30-1d2bb3db22f0

📥 Commits

Reviewing files that changed from the base of the PR and between 8f40ce0 and 24cf048.

📒 Files selected for processing (9)

• docs/plans/13-后端工程规范与架构治理计划.md
• docs/plans/README.md
• docs/prd/08-后端工程规范与架构治理.md
• docs/prd/README.md
• openspec/changes/backend-engineering-governance/design.md
• openspec/changes/backend-engineering-governance/proposal.md
• openspec/changes/backend-engineering-governance/specs/architecture-boundaries/spec.md
• openspec/changes/backend-engineering-governance/specs/shared-constants/spec.md
• openspec/changes/backend-engineering-governance/tasks.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/ste-311-backend-engineering-governance

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