docs: 저장소 위생(repo hygiene) 규약 추가

[jeongph]

제품(대개 OSS) 저장소에 인프라·운영 도구나 AI 세션 잡음을 넣지 않도록 하는 조직 규약을 rutter에 추가한다. 각 repo에 손으로 쓰는 대신 rutter가 소스가 되어 pilot apply로 배포한다(DRY·dogfood).

• docs/conventions/repo-hygiene.md — 무엇을 빼고(ops 도구·세션 잡음) 무엇을 남기는지(CI·CLAUDE.md·ADR·Why). 설계 근거(Why)는 잡음이 아님을 명시
• policies/core.yaml — PolicySet rule repo.hygiene (info) 추가

pilot package lint 통과 (PolicySet 2개 · rule 6개).

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added Korean-language repository hygiene guidance for product repositories.
  • Clarified which operational notes, temporary agent context, and local-only settings should be excluded.
  • Documented recommended repository content, including CI configuration, contributor guidance, and architectural decisions.
  • Included a contributor-facing decision checklist to help determine whether a file belongs in the repository.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 65eb7aed-040f-407e-bbe1-e2f597287e31

📥 Commits

Reviewing files that changed from the base of the PR and between 5cd2f1b and e5470c0.

📒 Files selected for processing (1)

• docs/conventions/shipshape.md

📝 Walkthrough

Walkthrough

Adds a Korean repository hygiene convention describing repository scope, excluded content, retained documentation, agent guidance files, and a contributor decision question.

Changes

Repository hygiene

Layer / File(s)	Summary
Repository hygiene convention docs/conventions/repo-hygiene.md	Defines repository content boundaries, including excluded operational and local-only materials, retained CI and architecture guidance, and criteria for deciding whether a file belongs in the repository.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 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	The title clearly and concisely summarizes the main change: adding a repo hygiene convention document.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/repo-hygiene

---

_{Comment @coderabbitai help to get the list of available commands.}

[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@policies/core.yaml`:
- Around line 33-37: Scope the repo.hygiene rule to product repositories only by
moving it into a product-specific PolicySet or adding the supported per-rule
repository scope; ensure infrastructure and private operational repositories are
excluded while preserving the rule’s existing statement and rationale.
- Around line 33-37: Update the repo.hygiene policy entry to either add
supported path or pattern checks that enforce its repository-content
requirements, or explicitly mark/document the rule as advisory rather than
machine-enforced. Preserve the existing statement and rationale, and follow the
check/advisory conventions used by the other PolicySet entries.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d8427d01-9391-4e77-96f7-473ac3d0e2b2

📥 Commits

Reviewing files that changed from the base of the PR and between e6a18ad and f767161.

📒 Files selected for processing (2)

• docs/conventions/repo-hygiene.md
• policies/core.yaml