[feature] implement actions for pipes (e.g. user talk/interact with pipes)

[louis030195]

basically let the user interact with the pipe like a button, chat, input, anything

use cases:

• "test" button to test pipes in the store and see if it works and then expose pipe.test() or pipe.health which would let pipe creators offer a way to check their pipe works / test out
• just a button for one-shot pipes like give me a summary of yesterday
• input text like kinda search query + button
• voice agent with pipes haha
• chat somewhere in the ui to chat with the pipes somehow
• gptstore-like assistant that people can create in pipes somehow to create custom agents that interact with their 24/7 screen recording

implementation:

• api in screenpipe-js and expose a pipe.register((message) => ...) or something like this (what about streaming?)
• or websocket
• something lower level
• or something else

[linear]

MED-198 [feature] implement actions for pipes