feat: Add TIAMAT cloud conversation memory driver

[toxfox69]

Summary

Adds TiamatConversationMemoryDriver — a cloud-based conversation memory driver for Griptape agents via TIAMAT Memory API.

• Implements BaseConversationMemoryDriver interface
• Cloud persistence — no local files, survives container restarts
• Cross-device — same agent memory accessible from anywhere
• FTS5 search — search past conversations without re-processing
• Zero infrastructure — no Redis or database, just an API key
• Only requires httpx

Usage

from griptape.drivers.memory.conversation.tiamat_conversation_memory_driver import (
    TiamatConversationMemoryDriver,
)
from griptape.memory.structure import ConversationMemory
from griptape.structures import Agent

driver = TiamatConversationMemoryDriver(api_key="your-key")
memory = ConversationMemory(driver=driver)
agent = Agent(conversation_memory=memory)

Files

• griptape/drivers/memory/conversation/tiamat_conversation_memory_driver.py — Driver implementation
• examples/tiamat_memory/agent_with_tiamat.py — Usage example
• examples/tiamat_memory/README.md — Documentation

Test Plan

• Verify store() persists conversation runs to TIAMAT cloud
• Verify load() retrieves most recent conversation state
• Verify graceful fallback (empty state) when API is unreachable