feat: Add Memory system with Weaviate integration and MCP tools

MEMORY SYSTEM ARCHITECTURE:
- Weaviate-based memory storage (Thought, Message, Conversation collections)
- GPU embeddings with BAAI/bge-m3 (1024-dim, RTX 4070)
- 9 MCP tools for Claude Desktop integration

CORE MODULES (memory/):
- core/embedding_service.py: GPU embedder singleton with PyTorch
- schemas/memory_schemas.py: Weaviate schema definitions
- mcp/thought_tools.py: add_thought, search_thoughts, get_thought
- mcp/message_tools.py: add_message, get_messages, search_messages
- mcp/conversation_tools.py: get_conversation, search_conversations, list_conversations

FLASK TEMPLATES:
- conversation_view.html: Display single conversation with messages
- conversations.html: List all conversations with search
- memories.html: Browse and search thoughts

FEATURES:
- Semantic search across thoughts, messages, conversations
- Privacy levels (private, shared, public)
- Thought types (reflection, question, intuition, observation)
- Conversation categories with filtering
- Message ordering and role-based display

DATA (as of 2026-01-08):
- 102 Thoughts
- 377 Messages
- 12 Conversations

DOCUMENTATION:
- memory/README_MCP_TOOLS.md: Complete API reference and usage examples

All MCP tools tested and validated (see test_memory_mcp_tools.py in archive).

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

memory/mcp/__init__.py

@@ -0,0 +1,56 @@
+"""
+Memory MCP Tools Package.
+
+Provides MCP tools for Memory system (Thoughts, Messages, Conversations).
+"""
+
+from memory.mcp.thought_tools import (
+    AddThoughtInput,
+    SearchThoughtsInput,
+    add_thought_handler,
+    search_thoughts_handler,
+    get_thought_handler,
+)
+
+from memory.mcp.message_tools import (
+    AddMessageInput,
+    GetMessagesInput,
+    SearchMessagesInput,
+    add_message_handler,
+    get_messages_handler,
+    search_messages_handler,
+)
+
+from memory.mcp.conversation_tools import (
+    GetConversationInput,
+    SearchConversationsInput,
+    ListConversationsInput,
+    get_conversation_handler,
+    search_conversations_handler,
+    list_conversations_handler,
+)
+
+__all__ = [
+    # Thought tools
+    "AddThoughtInput",
+    "SearchThoughtsInput",
+    "add_thought_handler",
+    "search_thoughts_handler",
+    "get_thought_handler",
+
+    # Message tools
+    "AddMessageInput",
+    "GetMessagesInput",
+    "SearchMessagesInput",
+    "add_message_handler",
+    "get_messages_handler",
+    "search_messages_handler",
+
+    # Conversation tools
+    "GetConversationInput",
+    "SearchConversationsInput",
+    "ListConversationsInput",
+    "get_conversation_handler",
+    "search_conversations_handler",
+    "list_conversations_handler",
+]