feature(dev-ex): dev debugger panel

This would be an absolutely amazing bonus for the dev experience: a dev debugger panel that allows the user to see the current state of things, giving them an inside look on states, agentInputContext, network requests & responses.

1. Currently in /examples/cedar-playground we have a basic v0 version of this exclusively for network calls and responses. However, it can be extended and made way better.

• Add streaming (streaming looks like the below)
• Add bonus rendering for
• Add the ability to "record" so we can go through how the state is being changed, how many times certain hooks/functions are invoked, etc.
• Add the ability to see and trace through stateSlice -> agentInputContext -> actual network sent.
• Let the panel be dragged around, like floatingButton
• Copy and paste a summary that can be used in an AI coding tool like cursor to debug code
• Copy and paste everything into a formatted message for any debug ticket

High level architecture that will help:

• https://docs.cedarcopilot.com/introduction/understanding-cedar-architecture-advanced
• https://docs.cedarcopilot.com/agent-backend-connection/custom-request
• https://docs.cedarcopilot.com/agent-backend-connection/custom-response-processing

I'd also look at the existing debuggerSlice, which has some of the basis needed for this

Here are some simple UI mockups I generated, but imo there's a lot of creativity and other things we can help with.