Send a file from the local machine to the user's Kilo app. This tool works only when this session is connected to Kilo cloud (remote CLI relay). It sends exactly one file per call, up to 4 MiB.

Use this tool ONLY for:
- Files the user explicitly asked to see on mobile ("show me the log file on my phone")
- Sharing a generated file (a report, chart, or artifact) so the user can view it in the app
- Sending a screenshot or image the user requested

Do NOT use this tool:
- For files the user did not ask to see — the user pulls files on demand
- For every file you generate or read — only when the user asks for it on mobile
- For files larger than 4 MiB — the tool rejects them; give the user the workspace path instead
- In a cloud-agent session — delivery is remote-CLI only

The filename visible on mobile is always the basename, never a full path. Older Kilo app builds ignore non-image file deliveries.
