docs: add ReMe2 architecture design documentation
- Add comprehensive design document (reme2.md) detailing the
three-layer architecture (L1/L2/L3) for the vault system
- Document new protocols for folder notes and memory management
- Specify interface contracts for memory_* and vault_* tools
- Outline implementation phases from current state to target
refactor: fix typo in personal retriever class
- Correct spelling error: 'retri eved_nodes' -> 'retrieved_nodes'
in PersonalRetriever.result assignment
chore: update gitignore with vault-related patterns
- Add '/vault' to ignore vault directory
- Add '/reme-plugin' to ignore plugin files
- Add '/reme2/vault' to ignore new vault implementation
```
- Integrate AnthropicChatModel with new AnthropicAsLLM component
- Add component formatters for OpenAI and Anthropic chat models
- Implement token counter component with estimated token counting
- Create base client component for ReMe service communication
- Refactor BaseComponent to remove app_context parameter from _start/_close
- Update embedding model base class to remove retry logic and use npz cache
- Add job component for sequential step execution with BaseJob
- Implement step component base class for LLM workflow execution
- Enhance application context with proper type annotations
- Update component initialization to pass app_context automatically
- Remove asyncio dependency from embedding model cache operations
