feat(workspaces): scaffold feature

Scaffold the workspaces feature package via pnpm turbo gen feature
(single Workspace entity, getWorkspace use case) and hand-wire the
aggregators: bindAll dispatcher (web-next), core-api app router, and
workspace deps. Release-please registration reverted per the root-only
versioning policy (AGENTS.md, ADR-027 retrofit). Pinned @trpc/server
to the repo-wide 11.16.0 resolution so instanceof TRPCError checks
share one module instance.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

packages/workspaces/package.json

@@ -0,0 +1,36 @@
+{
+  "name": "@repo/workspaces",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts",
+    "./ui": "./src/ui/index.ts",
+    "./cms": "./src/integrations/cms/index.ts",
+    "./api": "./src/integrations/api/router.ts",
+    "./di/bind-production": "./src/di/bind-production.ts",
+    "./di/bind-dev-seed": "./src/di/bind-dev-seed.ts"
+  },
+  "scripts": {
+    "build": "tsc --noEmit",
+    "lint": "eslint .",
+    "test": "vitest run --passWithNoTests",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@repo/core-shared": "workspace:*",
+    "@trpc/server": "^11.0.0",
+    "inversify": "^6.2.0",
+    "payload": "^3.14.0",
+    "reflect-metadata": "^0.2.2",
+    "zod": "^3.24.0"
+  },
+  "devDependencies": {
+    "@repo/core-eslint": "workspace:*",
+    "@repo/core-testing": "workspace:*",
+    "@repo/core-typescript": "workspace:*",
+    "@types/node": "^22.0.0",
+    "@vitest/coverage-v8": "^3.2.4",
+    "vitest": "^3.1.0"
+  }
+}