lellm 0.2.0

LeLLM — Rust LLM orchestration framework.

默认开启 provider（core + provider 适配层）。

# 默认：core + provider
lellm = "0.1"

# 需要 Agent 运行时
lellm = { version = "0.1", features = ["agent"] }

# 需要 Graph 编排层
lellm = { version = "0.1", features = ["graph"] }

# 全部启用
lellm = { version = "0.1", features = ["full"] }