* fix(reasoning): sanitize streamed K3 think tags
* refactor(stream): move think-tag helpers into thinkTagParser leaf module
open-sse/utils/stream.ts is frozen at 2887 lines with zero headroom, and the
kimi-coding-apikey think-tag handling added here pushed it to 2951. The parsing
half of that work has no SSE dependency, so it moves to thinkTagParser.ts (an
unfrozen leaf): the open-tag lookahead predicate and the end-of-stream flush
delta assembly. stream.ts keeps only the SSE envelope - enqueue, payload
collection, logging.
Getting back under the frozen ceiling needed more than just the PR's own
added lines, since even the fully self-gating helpers still cost a handful of
call-site lines stream.ts has zero room for. Along the way this also
deduplicates a synthetic chat-completion-chunk literal that was copy-pasted
three times in stream.ts (textual tool-call flush, think-tag flush, terminal
finish_reason synthesis) into one buildSyntheticChatChunk() in
streamHelpers.ts - pure DRY, no behavior change.
Behavior is unchanged: same tests, same counts.
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
---------
Co-authored-by: rinseaid <rinseaid@rinseaid.net>
Co-authored-by: diegosouzapw <diegosouzapw@users.noreply.github.com>
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
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