Extended the ProllyTree Python API with two major new components

[zhangfengcdt]

🧠 Agent Memory System

New Classes Added:

• AgentMemorySystem - Comprehensive memory system for AI agents
• MemoryType - Enum for different memory types (ShortTerm, Semantic, Episodic, Procedural)

Key Features:

• Short-term Memory: Conversation history with thread-based organization
• Semantic Memory: Facts and knowledge about entities with confidence scores
• Procedural Memory: Task procedures and instructions with prerequisites
• Git-backed Persistence: All memories are version-controlled
• Memory Optimization: Cleanup, consolidation, and archival capabilities
• Checkpointing: Create memory snapshots with commit messages

🗃️ VersionedKvStore

New Classes Added:

• VersionedKvStore - Git-backed versioned key-value store
• StorageBackend - Enum for storage types (InMemory, File, Git)

Key Features:

• Git Integration: Full version control with branching, commits, and history
• Staging Area: Git-like workflow for changes before committing
• Branch Management: Create, switch, and list branches
• Commit History: Track all changes with author and timestamp info
• Multi-Backend Support: Currently exposes Git backend (others available in Rust)