state

Conversations and agent tasks outgrow the context window, and naive 'stuff the whole history' fails on cost, latency, and lost-in-the-middle. The signal is a tiered memory design: recent buffer, summarized mid-term, retrieved long-term.

You cannot wait for all the data, and buffering an unbounded stream will OOM. The signal is windowed joins with watermarks for stream-stream, lookup joins for stream-table, and a clear story for late and out-of-order events.