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e38b1e1d05
Opt-in pipeline.streaming.clause_chunking splits the streamed LLM reply
into speakable clauses and synthesizes each as soon as it completes,
lowering time-to-first-audio instead of buffering the whole message. The
splitter is script-aware (rivo/uniseg, pure Go): UAX#29 sentence
segmentation handles CJK 。！？ with no whitespace, CJK clause
punctuation (，、；：) and Thai/Lao spaces give finer cuts, and a UAX#14
line-break cap bounds an over-long punctuation-less run. Unlike the old
ASCII .!?/newline segmenter (dropped in 076dcdbe) it does not degrade to
whole-message buffering for CJK/Thai; scripts needing a dictionary
(Khmer/Burmese) stay buffered until a space or end-of-message. Clauses
are synthesized synchronously in the token callback (the LLM keeps
generating into the gRPC stream meanwhile), so audio still starts
mid-generation. Off by default — the whole-message path is unchanged.
Also fix the streamed-reply path and the Talk page:
- Don't swallow streamed autoparser content as reasoning: the
tokenizer-template path already delivers reasoning-free content via
ChatDeltas, so prefilling the thinking start token re-tagged it as an
unclosed reasoning block, leaving no spoken reply. Disable the prefill
on that path; closed tag pairs are still stripped (#9985).
- Generate collision-free realtime IDs (16 random bytes) instead of a
constant, so per-item bookkeeping (cancel, conversation.item.retrieve)
works.
- Key the Talk transcript by the server item_id and upsert entries.
Realtime events arrive over a WebRTC data channel — outside React's
event system — so React defers the setTranscript updaters while
synchronous ref writes in handler bodies run first; the old
index-tracking ref rendered a duplicate assistant bubble on
completion. Upserts by item_id are idempotent and order-independent.
- Drop the partial assistant bubble on a cancelled response (barge-in):
the server discards the interrupted item and sends response.done with
status "cancelled"; mirror that in the UI so the regenerated reply
isn't rendered as a second assistant message.
Assisted-by: Claude:claude-opus-4-8 [Claude Code]
Assisted-by: Claude:claude-fable-5 [Claude Code]
Signed-off-by: Richard Palethorpe <io@richiejp.com>