Instead of fragile string matching to detect truncated spawn prompts,
the agent plugin now sets summaryIsFallback: true when the summary is
a first-message fallback rather than a real agent-generated summary.
- Add summaryIsFallback to AgentSessionInfo (core/types.ts)
- extractSummary() returns { summary, isFallback } in claude-code plugin
- Add summaryIsFallback to DashboardSession, propagate in serialize.ts
- Replace looksLikePromptExcerpt() with !session.summaryIsFallback
- Fix .js extension in format.ts import (review feedback)
- Add thorough tests for all layers of propagation
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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