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FN-5803: normalize streamed sentence spacing across message boundaries

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Ensure streamed agent text preserves sentence-boundary spacing even when providers split output across message boundaries.

- add stateful streaming delta normalizer that tracks prior text/thinking tail when partial blocks reset
- update executor and PI session subscriptions to use per-session normalizer instances for text_delta and thinking_delta events
- expand streaming-delta tests to cover cross-message/tool-call boundary spacing regressions
- add task notes documenting cross-message spacing refinement

Files changed:
 .../fn-5803-streaming-cross-message-space.md       |  5 ++
 .../engine/src/__tests__/streaming-delta.test.ts   | 86 +++++++++++++++++++++-
 packages/engine/src/executor.ts                    | 13 ++--
 packages/engine/src/pi.ts                          | 24 +++---
 packages/engine/src/streaming-delta.ts             | 44 ++++++++++-
 5 files changed, 155 insertions(+), 17 deletions(-)

Fusion-Task-Id: FN-5803

Fusion-Task-Lineage: 8f88d54c-bbc0-44dd-99fc-c69738ce0ca8
This commit is contained in:
gsxdsm
2026-05-31 23:24:53 -07:00
parent a44b6102e3
commit feceedbf7e
5 changed files with 155 additions and 17 deletions
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.changeset/fn-5803-streaming-cross-message-space.md Normal file
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"@runfusion/fusion": patch
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Repair dropped spaces after sentence-ending punctuation when streamed agent text is split across separate assistant messages by tool-call round-trips (chat and agent logs), by tracking a per-session running tail at the shared engine streaming-delta chokepoints. Completes FN-5789, which only covered within-message boundaries.