DRU-650 -- Other files reach the chat agent as links

[czpython]

A file that is not an image or audio, sent on WhatsApp or Slack, now reaches the agent as a link it can open. An operator's agent reads the copy with its own tools. A bot agent, which has no file tools, sees the link and the file's name.

• Before the prompt, send_turn uploads each such file from the file storage to {work_root}/chat/{conversation.id}/files/{file.id}/{name} with host.upload_file, the way it uploads the session archive to the conversation folder. Only the file's base name joins the path.
• The message gets a resource_link block with a file:// uri, the name, and the mime type. The three adapters turn it into a link or file part the agent can open.
• An image over MAX_UPLOAD_BYTES goes the same way, as a link, instead of a base64 block.
• Audio files add nothing to the prompt.
• docs/chat.md says what reaches the agent under WhatsApp and under Slack's Files.

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