DRU-649 -- Images reach the chat agent

[czpython]

A photo sent to a WhatsApp number or to the Slack bot now reaches the agent, on Claude, Codex, and OpenCode alike.

• The bridge's prompt request takes content, a list of ACP content blocks, and forwards it as the prompt. The body string goes away.
• send_turn builds the blocks: one text block per delivered message with its body, and one image block, base64 data and mime type, per message file whose type is image/* and whose size is at most MAX_UPLOAD_BYTES. Empty text blocks are left out.
• Both channels save a message's body as the typed text, empty when the person typed nothing. The file's name no longer stands in for it. A message with no text and no file still starts no turn.
• The web page shows a message with no text and a file without an empty text row.
• docs/chat.md says that an image reaches the agent, under WhatsApp and under Slack's Files.

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