syncAndBroadcastSummary was using the raw ParsedSummary (null when salvaged)
instead of summaryForStore for the SSE broadcast, causing a crash when the
LLM returns <observation> without <summary> tags. Also removes misplaced
tree-sitter docs from mem-search/SKILL.md (belongs in smart-explore).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>