Integrate OpenHandoff factory workspace (#212)

factory/research/specs/frontend.md

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+# frontend
+
+we need to build a browser-friendly version of our tui. we should try to keep the tui and gui as close together as possible. add this to agents.md
+
+be thorough and careful with your impelmentaiton. this is going to be the ground 0 for a lot of work so it needs to be clean and well structured with support for routing, clean state architecture, etc.
+
+## tech
+
+- vite
+- baseui
+- tanstack
+
+## arch
+
+- make sure that rivetkit is not imported in to either the cli or the gui. this should all be isoaletd in our client package. add this to agents.md
+
+## agent session api
+
+- expose the sandbox agent api on sandbox instance actor for managing sessions and sendin messages
+- agent session api should use @sandbox-agent/persist-rivet for persisting to rivet
+
+## layout
+
+- left sidebar is similar to the hf switch ui:
+    - list each repo
+    - under each repo, show all of the handoffs
+    - you should see all handoffs for the entire workspace here grouped by repo
+- the main content area shows the current workspace
+    - there is a main agent session for the main agent thatn's making the change, so show this by default
+    - build a ui for interacting with sessions
+    - see ~/sandbox-agent/frontend/packages/inspector/ for reference ui
+- right sidebar
+    - show all information about the current handoff
+
+## testing
+
+- use agent-browser cli to veirfy that all of this functionality works
+    - create handoff
+    - can see the handoff in the sidear
+    - clik on handoff to see the agent transcript