chore: import upstream snapshot with attribution

docs/ref/memory/openai_conversations_session.md

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+# `OpenAI Conversations Session`
+
+::: agents.memory.openai_conversations_session

docs/ref/memory/openai_responses_compaction_session.md

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+# `OpenAI Responses Compaction Session`
+
+::: agents.memory.openai_responses_compaction_session

docs/ref/memory/session.md

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+# `Session`
+
+::: agents.memory.session

docs/ref/memory/session_settings.md

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+# `Session Settings`
+
+::: agents.memory.session_settings

docs/ref/memory/sqlite_session.md

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+# `Sqlite Session`
+
+::: agents.memory.sqlite_session

docs/ref/memory/util.md

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+# `Util`
+
+::: agents.memory.util