## Summary
Adds a trace export to the run page. From the new **Export trace** menu
you can
copy a run's full trace to the clipboard as Markdown (for pasting into
an AI
assistant) or download it as a flat Log, a Markdown table, or JSON
Lines.
Internal engine-debug events are filtered out by default, and errors are
surfaced inline with their message.
## Design
The export streams events from the store to the gzipped response one at
a time
and never materialises the span tree, so a trace of any size exports
with
bounded memory and without stalling the server. Output is flat and
chronological: each line carries its own `spanId ← parentSpanId`, so the
hierarchy is reconstructable without nesting. Formats share a single
streaming
pipeline and are pluggable via `?format=log|jsonl|markdown`, so adding a
format
is an isolated change.
## Screenshots
**Export menu**
<img width="370" height="252" alt="trace-export-menu"
src="https://github.com/user-attachments/assets/3d10304a-8c49-4606-b15d-2859b137419f"
/>
**In context**
<img width="2400" height="1802" alt="trace-export-run-page"
src="https://github.com/user-attachments/assets/46c80b30-303b-47c6-9ace-a2fb06f6cb61"
/>
Chris Arderne