chore: officially migrate to submodule (#4502)

* remove apps/core and apps/fern

* fix precommit

* add submodule updates in workflows

* submodule

* remove core tests

* update core revision

* Add submodules: true to all GitHub workflows

- Ensure all workflows can access git submodules
- Add submodules support to deployment, test, and CI workflows
- Fix YAML syntax issues in workflow files

🤖 Generated with [Claude Code](https://claude.ai/code)

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

* remove core-lint

* upgrade core with latest main of oss

---------

Co-authored-by: Claude <noreply@anthropic.com>

examples/docs/node/example.ts

@@ -1,148 +0,0 @@
-import type {
-  AssistantMessage,
-  ReasoningMessage,
-  ToolCallMessage,
-  ToolReturnMessage,
-} from '@letta-ai/letta-client/api/types';
-
-/**
- * Make sure you run the Letta server before running this example.
- * See https://docs.letta.com/quickstart
- *
- * If you're using Letta Cloud, replace 'baseURL' with 'token'
- * See https://docs.letta.com/api-reference/overview
- *
- * Execute this script using `npm run example`
- */
-const client = new LettaClient({
-  baseUrl: 'http://localhost:8283',
-});
-
-const agent = await client.agents.create({
-  memoryBlocks: [
-    {
-      value: 'name: Caren',
-      label: 'human',
-    },
-  ],
-  model: 'openai/gpt-4o-mini',
-  embedding: 'openai/text-embedding-3-small',
-});
-
-console.log('Created agent with name', agent.name);
-
-let messageText = "What's my name?";
-let response = await client.agents.messages.create(agent.id, {
-  messages: [
-    {
-      role: 'user',
-      content: messageText,
-    },
-  ],
-});
-
-console.log(`Sent message to agent ${agent.name}: ${messageText}`);
-console.log(
-  'Agent thoughts:',
-  (response.messages[0] as ReasoningMessage).reasoning,
-);
-console.log(
-  'Agent response:',
-  (response.messages[1] as AssistantMessage).content,
-);
-
-const CUSTOM_TOOL_SOURCE_CODE = `
-def secret_message():
-    """Return a secret message."""
-    return "Hello world!"
-    `.trim();
-
-const tool = await client.tools.upsert({
-  sourceCode: CUSTOM_TOOL_SOURCE_CODE,
-});
-
-await client.agents.tools.attach(agent.id, tool.id);
-
-console.log(`Created tool ${tool.name} and attached to agent ${agent.name}`);
-
-messageText = 'Run secret message tool and tell me what it returns';
-response = await client.agents.messages.create(agent.id, {
-  messages: [
-    {
-      role: 'user',
-      content: messageText,
-    },
-  ],
-});
-
-console.log(`Sent message to agent ${agent.name}: ${messageText}`);
-console.log(
-  'Agent thoughts:',
-  (response.messages[0] as ReasoningMessage).reasoning,
-);
-console.log(
-  'Tool call information:',
-  (response.messages[1] as ToolCallMessage).toolCall,
-);
-console.log(
-  'Tool response information:',
-  (response.messages[2] as ToolReturnMessage).status,
-);
-console.log(
-  'Agent thoughts:',
-  (response.messages[3] as ReasoningMessage).reasoning,
-);
-console.log(
-  'Agent response:',
-  (response.messages[4] as AssistantMessage).content,
-);
-
-let agentCopy = await client.agents.create({
-  model: 'openai/gpt-4o-mini',
-  embedding: 'openai/text-embedding-3-small',
-});
-let block = await client.agents.blocks.retrieve(agent.id, 'human');
-agentCopy = await client.agents.blocks.attach(agentCopy.id, block.id);
-
-console.log('Created agent copy with shared memory named', agentCopy.name);
-
-messageText =
-  "My name isn't Caren, it's Sarah. Please update your core memory with core_memory_replace";
-response = await client.agents.messages.create(agentCopy.id, {
-  messages: [
-    {
-      role: 'user',
-      content: messageText,
-    },
-  ],
-});
-
-console.log(`Sent message to agent ${agentCopy.name}: ${messageText}`);
-
-block = await client.agents.blocks.retrieve(agentCopy.id, 'human');
-console.log(`New core memory for agent ${agentCopy.name}: ${block.value}`);
-
-messageText = "What's my name?";
-response = await client.agents.messages.create(agentCopy.id, {
-  messages: [
-    {
-      role: 'user',
-      content: messageText,
-    },
-  ],
-});
-
-console.log(`Sent message to agent ${agentCopy.name}: ${messageText}`);
-console.log(
-  'Agent thoughts:',
-  (response.messages[0] as ReasoningMessage).reasoning,
-);
-console.log(
-  'Agent response:',
-  (response.messages[1] as AssistantMessage).content,
-);
-
-await client.agents.delete(agent.id);
-await client.agents.delete(agentCopy.id);
-
-console.log(`Deleted agents ${agent.name} and ${agentCopy.name}`);