feat(session): add kugetsu_context_dump call in cmd_continue

Integrates the existing kugetsu_context_dump() function to capture
the initial user prompt before forking the agent.

Closes #212

skills/kugetsu/scripts/kugetsu-session.sh

@@ -501,6 +501,8 @@ cmd_continue() {
         exit 1
     fi
     
+    kugetsu_context_dump "$issue_ref" "$message" "$(issue_ref_to_branch_name "$issue_ref")"
+    
     local session_file=$(issue_ref_to_filename "$issue_ref")
     local session_path="$SESSIONS_DIR/$session_file"
     local opencode_session_id=$(python3 -c "import json; print(json.load(open('$session_path')).get('opencode_session_id', ''))" 2>/dev/null || echo "")