docs(skill): add upgrading guide and integrate compat into seed-design skill

[junghyeonsu]

배경

SEED는 2.0 이전(0.x·1.x)에 minor/patch에서도 breaking이 발생했고, @seed-design/react와 @seed-design/css를 호환되지 않는 버전으로 섞으면 클래스네임이 어긋나 스타일이 깨지는 문제가 있었습니다. 이 PR의 base인 feat/compat-manifest가 호환 매니페스트 + compat peer 검사로 "react@X ↔ css@Y 호환"을 판단하는 인프라를 추가했습니다.

이 PR은 그 위에 소비자용 업그레이드 가이드 + /seed-design 스킬 통합을 얹습니다. 서브에이전트 검증 결과 새 CLI 없이 지금 있는 것(공개 manifest + compat + changelog)만으로 호환 진단·마이그레이션 경로 제시가 가능함을 확인했기에, CLI 코드 변경은 없습니다.

변경 사항

docs

• 신규 react/migration/upgrading.mdx — 2.0 전후 버저닝 정책, react↔css 호환(compat 사용법), 단계별 업그레이드
• 개명 guide.mdx → from-sprout.mdx — Sprout→SEED 이주 전용 문서임을 명확히
• meta.json — 페이지 순서 (upgrading 우선)

skills/seed-design

• upgrade.md — compat --json/--with 통합, effective peers 해소(declared→correction→backfill), react↔css lockstep, changelog 경로 규칙(카테고리 항상 react·slug), semver range→from, target 필터, 2.0 전후 정책, 상황별 보고 형식
• migration.md — 스니펫 중심으로 명확화 + baseUrl 패턴 + 비대화형 --on-diff
• usage.md, SKILL.md — compat 새 옵션, 분기 라벨

검증

• bun docs:test 통과 (편집마다 hook)
• changelog 경로 라이브 200 확인
• 서브에이전트 시나리오 재검증 6/6 PASS (lockstep·경로·range·target·effective peers·2.0 정책)

참고

• Stacked PR: base가 feat/compat-manifest입니다. 해당 PR 머지 후 이 PR을 머지하거나 base를 dev로 retarget하세요.
• 단일 출처: 버저닝 정책(기여자)은 changeset 스킬의 version-matrix.md, 소비자 업그레이드/호환은 upgrading.mdx.

🤖 Generated with Claude Code

[changeset-bot]

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Latest commit: f715602

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[github-actions]

Alpha Preview (Stackflow SPA)

• Branch Preview URL: https://docs-seed-design-upgrading.seed-design-stackflow-spa.pages.dev
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• Preview URL: https://2e5bb241.seed-design.pages.dev
• Commit: f715602