refactor: rename eslint-config + typescript-config to core-eslint + core-typescript

Aligns tooling packages with the core-* naming convention used by all
other foundation packages (core-shared, core-cms, core-api, core-trpc,
core-ui). Updates ~50 files: package.json names, devDependencies,
tsconfig extends, eslint.config imports, vitest.config imports, AGENTS.md
references, and the boundaries plugin patterns to match the new paths.

The tooling-specific patterns in boundaries/elements are now ordered BEFORE
the broader core-* pattern to ensure correct first-match-wins behavior.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/core-eslint/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/core-eslint/base";
+import boundariesConfig from "@repo/core-eslint/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/core-eslint/base";
+import nextConfig from "@repo/core-eslint/next";
+import boundariesConfig from "@repo/core-eslint/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
+```

packages/core-eslint/base.js

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+import js from "@eslint/js";
+import eslintConfigPrettier from "eslint-config-prettier";
+import tseslint from "typescript-eslint";
+import turboPlugin from "eslint-plugin-turbo";
+import boundaries from "eslint-plugin-boundaries";
+
+export default [
+  { ignores: ["dist/**", "node_modules/**", ".next/**", ".turbo/**"] },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  eslintConfigPrettier,
+  {
+    plugins: { turbo: turboPlugin },
+    rules: {
+      "turbo/no-undeclared-env-vars": "warn",
+    },
+  },
+  {
+    plugins: { boundaries },
+    settings: {
+      "boundaries/elements": [
+        { type: "app", pattern: "apps/*" },
+        { type: "tooling", pattern: "packages/core-eslint" },
+        { type: "tooling", pattern: "packages/core-typescript" },
+        { type: "core-composition", pattern: "packages/core-api" },
+        { type: "core-composition", pattern: "packages/core-cms" },
+        { type: "core", pattern: "packages/core-*" },
+        { type: "feature", pattern: "packages/!(core-*)" },
+      ],
+    },
+    rules: {
+      "boundaries/element-types": [
+        2,
+        {
+          default: "disallow",
+          rules: [
+            { from: "app", allow: ["app", "core", "core-composition", "feature", "tooling"] },
+            { from: "feature", allow: ["core", "tooling"] },
+            { from: "core", allow: ["core", "tooling"] },
+            { from: "core-composition", allow: ["core", "feature", "tooling"] },
+            { from: "tooling", allow: ["tooling"] },
+          ],
+        },
+      ],
+    },
+  },
+];

packages/core-eslint/eslint.config.js

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+import baseConfig from "./base.js";
+
+export default baseConfig;

packages/core-eslint/next.js

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+import baseConfig from "./base.js";
+
+export default [
+  ...baseConfig,
+  { ignores: [".next/**", "out/**"] },
+];

packages/core-eslint/package.json

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+{
+  "name": "@repo/core-eslint",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "exports": {
+    "./base": "./base.js",
+    "./next": "./next.js",
+    "./react-internal": "./react-internal.js"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.20.0",
+    "@typescript-eslint/eslint-plugin": "^8.25.0",
+    "@typescript-eslint/parser": "^8.25.0",
+    "eslint": "^9.20.0",
+    "eslint-config-prettier": "^10.1.0",
+    "eslint-plugin-boundaries": "^4.2.2",
+    "eslint-plugin-turbo": "^2.4.0",
+    "typescript-eslint": "^8.25.0"
+  }
+}

packages/core-eslint/react-internal.js

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+import baseConfig from "./base.js";
+
+export default [...baseConfig];