feat(ECR-041): OpsCMS Banner 薄写面（Write-Wave 首刀）

Admin POST/PUT + admin.cms.write/审计；C 端 GET /home/banners；首页投影回退静态 homeFeeds；migration 000051；不碰 FeedSlot/支付/UGC。

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/HANDOFF/ECR-041-architect-to-engineer.md

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+# HANDOFF — Architect → Engineer · ECR-041
+
+**Date:** 2026-08-13  
+**ECR:** ECR-041 Banner 薄写面  
+**Auth:** `docs/WAVE0/WRITE_WAVE_AUTHORIZATION.md` · Human Coding Start  
+**Spec:** `.ai/product/feature-spec/ops-banner-write.md`  
+**BD:** `docs/BACKEND_DESIGN/BD-2026-041-banner-write.md`
+
+## Do
+
+1. Migration `000051_ops_banner_write` — grant `admin.cms.write` to `super_admin`  
+2. Admin `POST/PUT /admin/cms/banners*` + audit；C 端 `GET /home/banners`  
+3. user-h5 首页推荐区投影；空/失败回退 `homeFeeds`  
+4. admin-h5 CMS Banner 编辑（FeedSlot **只读**）  
+5. OpenAPI · CONTRACT_DIFF · integration AC  
+6. `repo-governance-check` PASS · TEST_REPORT · Close  
+
+## Don't
+
+FeedSlot 写 · soft-delete · 真支付 · UGC · Crisis/Handoff/ContentSafety · 扩 scope  
+
+## Done when
+
+Spec §8 AC 有测试证据；ECR Status Closed；Max Migration=`000051`  

docs/HANDOFF/ECR-041-engineer-to-reviewer.md

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+# HANDOFF — Engineer → Reviewer · ECR-041
+
+TestOpsCMSBannerWrite PASS · homeCatalog PASS · repo-governance PASS.  
+Ready for Closed. FeedSlot 写未实现（按边界）。