docs(agents): add per-package AGENTS.md for all feature packages

packages/blog/AGENTS.md

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+# AGENTS.md — blog
+
+Articles collection + content use cases (get article, list articles, create, publish, unpublish). Provides the Articles Payload collection and tRPC procedures for content management and retrieval.
+
+## What it owns
+
+- **Entities** — Article type, article-related errors (ArticleNotFound, InvalidSlug)
+- **Use cases** — Get article, list articles, create, publish, unpublish, delete
+- **Repository interface** — `IArticlesRepository` for article persistence
+- **Mock repository** — In-memory article store for tests
+- **Payload repository** — Real Payload-backed article repository (constructor-injected at boot)
+- **Payload collection** — Articles collection definition + hooks (publish timestamp, slugify)
+- **tRPC router** — Procedures for list, get-by-slug, create, publish
+- **DI container** — Per-feature InversifyJS container with blog symbols
+- **UI components** — Article-specific components (ArticleCard, ArticleList, etc.)
+
+## Public exports
+
+From `package.json`:
+- `.` — Article type + blog errors + UI components
+- `./api` — tRPC router (`blogRouter`)
+- `./cms` — Payload Articles collection
+- `./di/bind-production` — `bindProductionArticles()` to wire Payload repo at boot
+
+## What it must NOT import
+
+- Any other feature package (`@repo/auth`, `@repo/media`, etc.)
+- Any app package
+- `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`, `@repo/core-ui` directly; only import from `@repo/core-shared` and use DI for Payload config
+
+## Layer rules
+
+### `src/` files use relative imports
+
+Avoid `@/` in source code:
+
+```typescript
+// ✓ Correct
+import type { IArticlesRepository } from "../repositories/articles.repository.interface.js";
+
+// ✗ Wrong (don't do this in src/)
+import { Article } from "@/entities/article.js";
+```
+
+### Tests use @/ alias
+
+Test files use `@/`:
+
+```typescript
+// ✓ Correct
+import { getArticleUseCase } from "@/application/use-cases/get-article.use-case.js";
+```
+
+### DI container is per-feature
+
+Tests rebind their own container:
+
+```typescript
+import { container as blogContainer, BLOG_SYMBOLS } from "@/di/container.js";
+import { MockArticlesRepository } from "@/infrastructure/repositories/mock-articles.repository.js";
+
+beforeEach(() => {
+  blogContainer.unbindAll();
+  blogContainer.bind(BLOG_SYMBOLS.IArticlesRepository).to(MockArticlesRepository);
+});
+```
+
+## Test conventions
+
+- **Unit tests** colocated with source: `*.test.ts` suffix
+- **Feature tests** in `tests/` folder: `*.feature.test.ts` suffix (cross-layer tests like publish flow)
+- **Vitest environment** — `node`
+- **Alias** — `@/` resolves to `src/`
+- **Run** — `pnpm test --filter @repo/blog`
+
+Covered areas: article CRUD use cases, slug validation, publish/unpublish flows, DI container binding.
+
+## Structure
+
+```
+src/
+  entities/
+    article.ts               # Article schema + type
+    errors.ts                # ArticleNotFound, InvalidSlug, etc.
+  application/
+    repositories/
+      articles.repository.interface.ts
+    use-cases/
+      get-article.use-case.ts
+      list-articles.use-case.ts
+      publish-article.use-case.ts
+  infrastructure/
+    repositories/
+      payload-articles.repository.ts   # constructor-injected: Config
+      mock-articles.repository.ts
+  di/
+    symbols.ts               # BLOG_SYMBOLS
+    container.ts             # blogContainer
+    bind-production.ts       # bindProductionArticles(container, config)
+  interface-adapters/
+    controllers/
+      articles.controller.ts # input validation
+  integrations/
+    cms/
+      collections/
+        articles.ts          # Payload CollectionConfig
+      hooks/
+        after-publish.ts     # revalidate, effects
+      index.ts
+    api/
+      router.ts              # tRPC procedures
+      index.ts
+  ui/
+    article-card.tsx
+    article-list.tsx
+    query.ts                 # typed tRPC query helpers
+  index.ts                   # re-exports: Article, UI components
+tests/
+  publish-article.feature.test.ts
+```