F1 (data loss): packages/mcp keeps its own copy of the document schema
(AGENTS.md), and the spoiler mark was only added to editor-ext + the server
tiptapExtensions, so a doc with a spoiler silently lost the mark through /mcp.
Add a local Spoiler mark to docmostExtensions (span[data-spoiler] parse,
data-spoiler="true"+class render) and a case "spoiler" in markdown-converter
emitting the same <span data-spoiler="true">…</span> as the editor-ext turndown
rule; add an MCP json->md->json round-trip test. Regenerated build/lib output.
F2: add the #259 inline-spoiler entry to CHANGELOG [Unreleased] Added.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
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