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* fix(middleware): target the latest user message on first-turn fallback injection When an earlier turn ends without any dynamic-context reminder — e.g. the async abefore_agent degraded path times out and skips injection (issue #3402's guard) — the next turn enters the first-injection branch (last_date is None) on a history that already holds several turns. That branch scanned from the start and attached the ID-swap to the FIRST user message. The swap's {id}__user copy is appended by add_messages, so the stale first prompt moved to the tail of history, ahead of the current question — and the model answered the old prompt as if it were the current turn. Scan from the end instead (matching the midnight-crossing branch) so the reminder attaches to the latest user message and history order is preserved. Genuine first turns are unaffected: they have exactly one message, which is both first and last. The pre-existing test_injects_only_into_first_human_message_not_later_ones case encoded the buggy target selection and is updated to the corrected contract. * refactor: rename first_idx to target_idx after reversed scan The branch now scans from the end, so the local holds the LAST user injection target; first_idx read misleadingly. Match the midnight-crossing branch's naming convention and clarify the log line accordingly. No behavior change.