feat(framework)!: remove service-ai — open edition is MCP-only (ADR-0025 S2)

Completes the ADR-0025 migration on the framework side. @objectstack/service-ai
(in-UI AI runtime + ask agent) now lives in cloud/packages/service-ai (closed).
The open framework exposes AI only via @objectstack/mcp (BYO-AI).

- delete packages/services/service-ai
- drop dep from packages/cli + examples/app-todo (CLI keeps its dynamic-import
  + silent-skip path for cloud/EE hosts)
- remove app-todo's 7 in-UI-AI tests; keep mcp-actions.test.ts (CE test that
  proves actions work over MCP with no service-ai)
- drop service-ai from .changeset/config.json fixed[]
- de-stale ai-capabilities + packages docs (open AI -> MCP)

Verified: turbo build (CLI + example-todo closures) green; app-todo CE
MCP-actions E2E passes with service-ai absent.

BREAKING CHANGE: @objectstack/service-ai is no longer published from the open
framework. Self-hosted open runtimes use @objectstack/mcp (BYO-AI).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

.changeset/config.json

@@ -59,7 +59,6 @@
       "@objectstack/nextjs",
       "@objectstack/nuxt",
       "@objectstack/sveltekit",
-      "@objectstack/service-ai",
       "@objectstack/service-analytics",
       "@objectstack/service-automation",
       "@objectstack/service-cache",

content/docs/guides/ai-capabilities.mdx

@@ -7,6 +7,8 @@ description: "Complete guide to leveraging AI agents, RAG pipelines, and intelli
 
 Complete guide to leveraging AI agents, knowledge retrieval, and intelligent automation in ObjectStack.
 
+> **Note — the open edition exposes AI via MCP (BYO-AI).** Per ADR-0025, the in-UI AI runtime (`@objectstack/service-ai`: agents, the `ask`/`build` assistants, in-product chat) ships in the **cloud / Enterprise** distribution, not the open framework. A self-hosted **open** runtime instead exposes its objects, queries, and business actions to *your own* AI — Claude, Cursor, any MCP client, or a local model — through **`@objectstack/mcp`** (bring-your-own-AI, zero platform AI cost). The `@objectstack/service-ai` examples below therefore describe the cloud/EE distribution.
+
 ## Table of Contents
 
 1. [AI Architecture](#ai-architecture)

content/docs/guides/packages.mdx

@@ -16,7 +16,7 @@ ObjectStack is organized into **70 package manifests** across multiple categorie
 | **Framework adapters** | 7 | `express`, `fastify`, `hono`, `nestjs`, `nextjs`, `nuxt`, `sveltekit` |
 | **Drivers** | 4 | `driver-memory`, `driver-sql`, `driver-sqlite-wasm`, `driver-mongodb` |
 | **Plugins** | 22 | `plugin-auth`, `plugin-security`, `plugin-org-scoping`, `plugin-audit`, `plugin-approvals`, `plugin-sharing`, `plugin-email`, `plugin-webhooks`, `plugin-reports`, `plugin-hono-server`, `mcp`, `plugin-msw`, `plugin-dev`, trigger plugins, and knowledge/embedder plugins |
-| **Platform services** | 17 | `service-ai`, `service-analytics`, `service-automation`, `service-cache`, `service-cluster`, `service-cluster-redis`, `service-datasource`, `service-feed`, `service-i18n`, `service-job`, `service-knowledge`, `service-messaging`, `service-package`, `service-queue`, `service-realtime`, `service-settings`, `service-storage` |
+| **Platform services** | 16 | `service-analytics`, `service-automation`, `service-cache`, `service-cluster`, `service-cluster-redis`, `service-datasource`, `service-feed`, `service-i18n`, `service-job`, `service-knowledge`, `service-messaging`, `service-package`, `service-queue`, `service-realtime`, `service-settings`, `service-storage` |
 
 
 ## Core Packages
@@ -194,15 +194,6 @@ const driver = new SqliteWasmDriver({ filename: ':memory:' });
 
 All services implement contracts from `@objectstack/spec/contracts` and are kernel-managed singletons.
 
-### @objectstack/service-ai
-
-**AI Service** — LLM adapter layer, conversation management, tool registry.
-
-- **Supports**: OpenAI, Anthropic, Google, custom providers via Vercel AI SDK
-- **Features**: Multi-model support, streaming, tool calling, conversation history
-- **When to use**: AI-powered features, chatbots, agents, RAG pipelines
-- **README**: [View README](/packages/services/service-ai/README.md)
-
 ### @objectstack/service-analytics
 
 **Analytics Service** — Multi-driver analytics with NativeSQL, ObjectQL, InMemory strategies.
@@ -515,11 +506,11 @@ The snippets below illustrate which **runtime** packages you typically reach for
 // Host bootstrap (pseudocode — exact shape depends on adapter)
 import { ObjectKernel } from '@objectstack/core';
 import { SqliteWasmDriver } from '@objectstack/driver-sqlite-wasm';
-import { createServiceAiPlugin } from '@objectstack/service-ai';
+// Open edition: AI is exposed via @objectstack/mcp (BYO-AI), not an in-process plugin.
 
 const kernel = new ObjectKernel();
 await kernel.use(new SqliteWasmDriver({ filename: ':memory:' }));
-await kernel.use(createServiceAiPlugin({ /* model providers */ }));
+// Point your own AI (Claude/Cursor/local model) at objects, queries & actions over MCP.
 await kernel.bootstrap();
 ```
 

examples/app-todo/package.json

@@ -34,7 +34,6 @@
     "@objectstack/objectql": "workspace:^",
     "@objectstack/knowledge-memory": "workspace:*",
     "@objectstack/runtime": "workspace:^",
-    "@objectstack/service-ai": "workspace:*",
     "@objectstack/service-knowledge": "workspace:*",
     "@objectstack/spec": "workspace:*"
   },