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* fix(agents): skip dateless reminders in dynamic-context date scan _last_injected_date returned at the first message flagged dynamic_context_reminder regardless of whether it carried a <current_date>. Since #3630 split injected context into a date SystemMessage plus a separate dateless <memory> HumanMessage, the reverse scan hit the memory message first and returned None, making a later turn look like the first turn. The middleware then re-injected, re-targeted the previous turn's __user message via the ID swap, and left the stale message as the latest human turn -- so the model re-answered the previous message and the persisted message stream got scrambled. Skip flagged reminders without a <current_date> so the scan reaches the real date SystemMessage. Add a regression test for the 2nd-turn + memory-enabled scenario. Fixes #3684 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(agents): make injected reminder date authoritative via metadata Promote the dynamic-context date out of message content into additional_kwargs["reminder_date"] on the date SystemMessage. _last_injected_date reads that key instead of regex-parsing content, with a SystemMessage-scoped content fallback for checkpoints written before the key existed. This removes two structural fragilities raised in review of #3685: - the boolean dynamic_context_reminder flag no longer has to also mean "carries a date" -- dateless reminders simply lack reminder_date and are skipped, so a future reminder type cannot reproduce the shadowing bug. - the date regex no longer runs on the user-influenceable memory HumanMessage, so a memory fact containing a literal <current_date> cannot spoof the injected date (false same-day skip / false midnight crossing). Add regression tests for memory date-spoofing, structured-date stamping, and legacy (no-key) detection; update existing date-reminder fixtures to the production shape. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>