Merge remote-tracking branch 'origin/master' into worktree/web-multimodal-image-input

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-05-reconstructable-requests.i18n.yaml
#	docs/core-data-structures/core.i18n.yaml
#	docs/module-graph.md
#	packages/client/ui-conversation/src/client/chat/AssistantMarkdown.tsx
#	packages/client/ui-conversation/src/client/index.ts
#	packages/compact/compact-basic/README.i18n.yaml

packages/client/ui-trajectory/tests/layout.spec.tsx

@@ -324,7 +324,10 @@ describe('deriveTrajectoryLayout', () => {
       },
       // A landed compaction renders no cell, but is still a real log position,
       // so it moves the cursor after the visible context row.
-      { kind: 'compaction', seq: 5, time: 9_500, summary: 'checkpoint facts' },
+      {
+        kind: 'compaction', seq: 5, time: 9_500, summary: 'checkpoint facts',
+        summaryEventSeq: 4, shadowedItemCount: 2, shadowedTokenCount: 100,
+      },
       {
         kind: 'assistant', seq: 6, time: 10_000, turn: 1, step: 0,
         blocks: [{ kind: 'text', text: 'done' }],