Agent 0.5.6

• Fix: with Gemini 3 models (e.g. gemini-flash-latest) the agent failed on its first tool use with "Function call is missing a thought_signature". The app now keeps Google's signature and sends it back, and older saved conversations keep working.
• New: the agent can upload files into web pages by itself (documents you attach in chat, files it makes, photos), for example to have a site read a document it can't.

SHA-256: 20658e1fe4bb170baaa1a3af9e8a4192f5891cb5ed3c9e950c625b1d155fa8c4