Modify Claude agent

[AyushKarupakula]

Add PDF document support

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Note

Adds handling for JSON tool outputs containing base64 PDFs by emitting Claude document blocks, with updated types and helper.

• Agent (hud/agents/claude.py):
  • Tool result formatting: Parse JSON TextContent for pdf_base64; attach as Claude document block (with optional title text) before continuing normal processing; retains error/image/text handling.
  • New helper: document_to_content_block(filename, mime_type, base64_data) to build document blocks.
  • Types: Import and use BetaDocumentBlock; update tool_use_content_block to accept document blocks.
  • Docs: Expand format_tool_results docstring to mention file attachments (PDFs), images, and text.

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New suggestion: Add comprehensive Claude agent documentation with PDF support for PR #165