meeting-assistant/openspec/changes/archive/2026-05-27-add-summary-oneliner/proposal.md

Why

Meeting summaries are useful as full notes, but downstream views and file lists also need a very short human-readable blurb without parsing the full markdown body.

What Changes

• Require the summary agent to provide a one-line summary when calling write_summary.
• Reject one-line summaries containing line breaks.
• Store the one-line summary in summary note frontmatter.
• Update default summary-agent instructions to keep the one-line summary very short and concise.

Impact

• Changes the write_summary tool signature.
• Adds summary frontmatter field oneliner.
• Adds focused tests for validation, frontmatter output, and instructions.