Sol proposes structured format for human-agent handoffs beyond Markdown

According to a GitHub repository, Sol is proposed as a self-contained computational artifact format for human and agent exchange that preserves execution structure, source cells, outputs, provenance, actor records, failures, verification, and history. The format is presented as an improvement over Markdown and raw HTML output for agent work, addressing what the proposal describes as technical debt in handoff mechanisms. The repository includes a Python validator and 31 conformance test cases.