Summary

Cargo 支持已在 quantex doctor --json 的 data.installers 中增加 cargo 字段，但 quantex schema doctor 返回的 JSON Schema 仍只声明 brew/bun/npm/winget，且在 installers 上使用 additionalProperties: false。任何按该 schema 严格校验真实 doctor 输出的集成都会误报失败。本 PR 将 cargo 纳入 schema 的 properties 与 required，并补充测试与 OpenSpec 契约说明。另移除 src/self/index.ts 中与 export from './facts' 重复的导入，消除 oxlint 的未使用导入报错（否则本地/CI 无法通过 bun run lint）。

Linked Artifacts

• OpenSpec: openspec/changes/fix-doctor-json-schema-cargo-installer

Validation

• bun run memory:check
• bun run lint
• bun run format:check
• bun run typecheck
• bun run test (if behavior changed)
• Not run, explained below

在本环境中通过 ./node_modules/.bin/oxlint、oxfmt --check、tsc --noEmit、vitest run 完成等价校验。memory:check 脚本依赖 Bun 的 import.meta.dir，当前沙箱无 Bun 未执行。

Release Intent

• Release: patch - bug fix

Docs Updated

• openspec/...

Scope Check

• I did not add a new ad hoc root-level Markdown file.
• I updated the relevant issue, ADR, spec, runbook, or captured the missing doc work as follow-up.
• I did not silently expand project scope without recording it explicitly.

Closure Check

• Working tree was clean after commit.
• Branch was pushed and this PR is the active delivery artifact.
• OpenSpec change is not needed, still active by design until merge, already archived, or queued for agent-driven archive closure.
• Release is not applicable, delegated to release automation, or verified.

Notes

无。