Compaction summary not accessible in-session or via /export

Problem

When a conversation is auto-compacted, the compaction summary is stored in the transcript .jsonl file but is not accessible through normal user-facing mechanisms:

1. /export doesn't include the compaction summary — exporting a compacted conversation omits the summary entirely, even though it exists in the raw transcript (as a compact_boundary + isCompactSummary message).

1. No way to view the summary in-session — after compaction, the summary is only visible in the session list preview (Ctrl+V) but cannot be viewed from within the active conversation. The rewind menu (Esc+Esc) shows the compaction as a checkpoint but selecting it would roll back the conversation rather than display the summary.

Expected behavior

• /export should include the compaction summary as part of the exported conversation
• There should be a way to view the compaction summary from within the active session (e.g., a command like /compact-summary, or include it in /context output)

Workaround

Currently the only way to retrieve the summary is to dig into the raw .jsonl transcript file and extract the isCompactSummary message with jq.