Add Image File Support as a Knowledge Source

Description

Feature Request: Image File Support in Knowledge Sources

Problem

Currently, the knowledge agent only supports text-based sources (GitHub repos,
YouTube transcripts, custom APIs). Many real-world knowledge bases contain
valuable information embedded in images — diagrams, charts, screenshots,
scanned documents, and architecture diagrams — which the agent cannot process.

Proposed Solution

Add support for image files (.png, .jpg, .jpeg, .webp, .gif) as a
knowledge source type, enabling the agent to:

1. Ingest images from configured sources (GitHub repo folders, URLs, uploads)
2. Extract text/content via OCR or a multimodal LLM
3. Store extracted content in the sandbox snapshot so existing grep/cat
   tools can search it like any other text file
4. Preserve image metadata (filename, alt text, captions) alongside content

Use Cases

• Searching architecture diagrams or flowcharts stored as images
• Indexing scanned PDFs or documentation screenshots
• Querying infographics and charts containing embedded text
• Supporting docs where visuals are the primary communication medium

Additional context

No response

No files, tests, or entry points are identified in the issue. Start by tracing how current GitHub repositories, YouTube transcripts, and custom APIs become sandbox snapshot content, then determine where image ingestion, OCR or multimodal extraction, and metadata preservation fit. Done means supported image sources can be searched through the existing text tools with their metadata retained.