The body field in buildContextSnapshot was passing the full raw file
content (including YAML frontmatter delimiters) instead of just the
body text. When handleEditorChange reconstructed tab content with empty
blocksToMarkdownLossy output, the body became frontmatter-only — causing
the AI to report "has frontmatter but no body content."
Three changes:
1. Strip frontmatter from body using splitFrontmatter before setting the
body field (frontmatter is already a separate parsed field)
2. Add wordCount to the context snapshot so the AI can detect when body
is stale vs genuinely empty
3. Instruct the AI to call get_note MCP tool when body is empty but
wordCount > 0, providing a safety net for any content staleness
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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