More Graphcore Changes

[jtoman]

• Allow binding the checkpointer to be used by the builder (it can still be overridden by explicit arguments to compile)
• Allows declaring tools with dependencies, constructed with Tool.with_deps(deps).as_tool("name"). Uses kinda gross contextvars, but it prevents having to close over tool dependencies, so this is the lesser of two evils
• Utility for extracting token usage metadata from AI messages
• Async memory backends:
  • to solve the function coloring problem, we extract the IO effect handling of the memory backends to Async/Sync backends, and the actual logic is in BackendPure. The yield generator stuff makes your head hurt, but no duplicated implementations
• Tests:
  • A test framework for building simulated interactions with an llm with tool calls
  • tests for memory tool and vfs tool
• Switches to UV and pyproject.toml as the one true source of package management.

[shellygr]

hard for me to track changes here since this file was moved, the generator stuff is indeed tricky

[shellygr]

what does this test?

[jtoman]

nothing, it sets up test fixtures used by the memory test.