Streaming partials were appended to log.raw per chunk, each carrying the
full cumulative content, so one response left dozens of partial lines
persisted. GUI clients parsing the snapshot re-rendered the growing block
once per partial (O(N^2)) and replayed all historical partials on every
reconnect, causing intermittent rendering loops.
Partials are no longer persisted: AppendBlock writes only finalized
blocks to log.raw; SetPartial broadcasts the in-flight block without
storing it. New chat.raw StreamRaw file is the authoritative live JSONL
source (finalized history replay, then live deltas); log.raw is a
finalized-only one-shot snapshot. GUI streams chat.raw, never polls
log.raw.
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