- reduce the number of API keys needed (Use simple tool)
- make everything "tool use" oriented rather than split across agent executor, function calling, tool use, etc.
- Reorg navbar and index
- Fixup some docstrings
- Add more links to ref docs
- Mix up models used
- Simplify a few examples
- allows us to set run output different from streamed values: here the run output should always be final value of all channels
- removes 1-2 more frames from stack traces
- Do not run node if it's a passthrough
- Do not run writers that wouldn't affect any channels
- Combine consecutive writers when it doesn't change semantics
