fix: memory summary shows source events + default expanded content

buildSummary now always includes raw source event content under a
"Source events" section, so users can see both the compressed summary
AND the original pre-compression data. Previously only the summary
was shown, and source events were lost after processing.

MemoryRecordContent now defaults to expanded when content is short
enough (not collapsible), so summaries are immediately visible
without clicking.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: IM.codes

src/context/materialization-coordinator.ts

@@ -223,16 +223,15 @@ function buildSummary(events: LocalContextEvent[]): string {
   if (decisions.length > 0) {
     sections.push(`- Key decisions: ${decisions.join('; ')}`);
   }
-  // Fallback: include raw event content when no structured pairs/decisions were extracted
-  if (turnPairs.length === 0 && decisions.length === 0) {
-    for (const event of events) {
-      const content = event.content?.trim();
-      if (content) {
-        sections.push(`- [${event.eventType}] ${content.length > 500 ? content.slice(0, 500) + '…' : content}`);
-      }
+  // Always include raw source events so the user can see pre-compression content
+  sections.push(`\n---\n**Source events (${events.length}):**`);
+  for (const event of events) {
+    const content = event.content?.trim();
+    if (content) {
+      const truncated = content.length > 800 ? content.slice(0, 800) + '…' : content;
+      sections.push(`- \`${event.eventType}\`: ${truncated}`);
     }
   }
-  sections.push(`\nCompressed from ${events.length} event${events.length === 1 ? '' : 's'}.`);
   return sections.join('\n');
 }
 

web/src/components/SharedContextManagementPanel.tsx

@@ -1927,11 +1927,12 @@ function MemoryRecordContent({
   t: (key: string) => string;
 }) {
   const collapsible = shouldCollapseMemoryContent(text);
+  const showExpanded = expanded || !collapsible;
   return (
     <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
       <div
         data-testid={`memory-record-content-${id}`}
-        style={expanded ? memoryContentExpandedStyle : memoryContentCollapsedStyle}
+        style={showExpanded ? memoryContentExpandedStyle : memoryContentCollapsedStyle}
       >
         <ChatMarkdown text={text} />
       </div>