* fix(talk): use truncateUtf16Safe for snippet text truncation
fast-context-runtime.ts normalizeSnippet and heartbeat-events-filter.ts
buildExecEventPrompt used raw .slice(0, N), which can produce lone
surrogates when truncation boundaries cross emoji surrogate pairs.
* test(talk): cover UTF-16 snippet boundary
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Co-authored-by: hailory <hailory@xydigit.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
Co-authored-by: Peter Steinberger <peter@steipete.me>
xydt-tanshanshan
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