docs(agents): add per-package AGENTS.md for eslint-config + typescript-config

packages/eslint-config/AGENTS.md

@@ -0,0 +1,67 @@
+# AGENTS.md — eslint-config
+
+Shared ESLint 9 flat configs (rules, plugins, parser settings) consumed by all packages via `eslint.config.js`.
+
+## What it owns
+
+- **`base.js`** — Core ESLint rules: no `console`, no `debugger`, strict `@typescript-eslint` config
+- **`next.js`** — Next.js-specific rules: `"use client"` boundaries, `next/no-img-element`
+- **`react-internal.js`** — React library rules: component display names, hook rules
+- **`boundaries.js`** — `eslint-plugin-boundaries` config enforcing vertical feature architecture:
+  - Features may only import `core-*` and tooling packages
+  - Core packages may only import other core packages (with composition exceptions for `core-cms`, `core-api`)
+  - No cross-feature imports
+  - No deep source path imports (only public subpath exports)
+
+## How packages consume them
+
+Each package creates `eslint.config.js` at its root:
+
+```javascript
+// packages/blog/eslint.config.js
+import baseConfig from "@repo/eslint-config/base";
+import boundariesConfig from "@repo/eslint-config/boundaries";
+
+export default [
+  ...baseConfig,
+  ...boundariesConfig,
+  {
+    files: ["src/**/*.tsx"],
+    rules: {
+      "react/display-name": "off",
+    },
+  },
+];
+```
+
+Apps may add Next.js-specific rules:
+
+```javascript
+// apps/web-next/eslint.config.js
+import baseConfig from "@repo/eslint-config/base";
+import nextConfig from "@repo/eslint-config/next";
+import boundariesConfig from "@repo/eslint-config/boundaries";
+
+export default [
+  ...baseConfig,
+  ...nextConfig,
+  ...boundariesConfig,
+];
+```
+
+## Test conventions
+
+- No unit tests (config validation via lint pass/fail in other packages)
+- Verify at CI: `pnpm lint` succeeds across all packages
+- ESLint should catch boundary violations: `pnpm lint` fails on feature→feature imports or deep imports
+
+## Structure
+
+```
+src/
+  base.js                    # Core TypeScript + ESLint config
+  next.js                    # Next.js additions
+  react-internal.js          # React library rules
+  boundaries.js              # Feature boundaries + composition rules
+  index.js                   # Re-exports all configs
+```