docs: record error boundary safeguards

[IceCodeNew]

Summary

• require secondary failure bookkeeping to preserve the original business exception
• forbid coercive scalar normalization at configuration boundaries
• distinguish application-owned fixed choices from SDK-owned dynamic provider namespaces

Verification

• mise exec -- uv run --with pytest --with pytest-cov -- pytest --cov --cov-branch --cov-report=xml
• prek run --all-files

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[IceCodeNew]

/agentic_review

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[IceCodeNew]

这两条开发规则已分别并入其对应的代码 PR：

• 错误处理中的次要记账边界 → fix: preserve briefing task failures #51
• 配置输入与 provider 命名空间边界 → fix: validate application configuration contracts #52

关闭这个独立文档 PR，以便规则与引入它们的代码改动共享历史和审查上下文。