Cached AIAgent instances retain _last_flushed_db_idx from previous turns. When the agent is reused, the stale index causes _flush_messages_to_session_db to skip user messages that fall below the old flush cursor, silently dropping them from state.db. This manifests as persistent context loss — every turn shows history=0 even after multiple exchanges.

Reset the flush cursor in _init_cached_agent_for_turn so each turn starts with a clean flush state.

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• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

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