Session restore drops messages between tool results

[dimakis]

Bug

When a session is interrupted and restored from history, messages between a tool result and the subsequent assistant response can be lost. The user sees:

1. The tail end of the last visible assistant message
2. A "Session interrupted. Messages above were restored from history — some recent content may be missing." banner
3. The next tool call shown as still "Running..."

Expected: All messages should be restored from history, preserving the full conversation flow.

Observed: Middle messages (between a Write tool completing and the assistant's follow-up analysis) were silently dropped. The conversation jumps from the tool execution to a later response with no indication of what was lost.

Repro

1. Start a conversation with multiple tool calls and assistant responses
2. Trigger a session interruption (e.g., network drop, app background)
3. Restore the session
4. Observe missing messages in the restored history

Screenshot

See .mitzo-images/image-1775840926380-0.png in the mgmt repo — shows the gap and "Session interrupted" banner.

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