[GH] (burr/stefan/improve-generator-spans): Workflow run "Build Sphinx Documentation" failed!

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The GitHub Actions job "Build Sphinx Documentation" on burr.git/stefan/improve-generator-spans has failed.
Run started by GitHub user skrawcz (triggered by skrawcz).

Head commit for run:
7f34286be6cfb473a671d9f77c2420ba3764597d / Stefan Krawczyk <st...@cs.stanford.edu>
Add streaming timing to Burr tracker, UI, and documentation

Surface generation-vs-consumer timing data in the Burr tracker and UI,
independent of the OpenTelemetry streaming telemetry modes.

Tracker changes:
- Extend StreamState with timing fields (generation_time_ns,
  consumer_time_ns, first_item_time_ns, etc.) accumulated via
  PreStreamGenerateHook/PostStreamGenerateHook
- Add generate hooks to SyncTrackingClient in both base.py and
  client.py with defensive getattr for subclass compatibility
- Add optional timing fields to EndStreamModel (generation_time_ms,
  consumer_time_ms, first_item_time_ms) with None defaults for
  backwards compatibility
- Update post_end_stream in both LocalTrackingClient and
  S3TrackingClient to convert and write accumulated timing

UI changes:
- Add timing fields to EndStreamModel.ts TypeScript type
- Update StepList.tsx end_stream rendering to show
  "gen: Xms · consumer: Yms · N items · TTFT: Zms" when timing
  data is available, falling back to legacy throughput display

Documentation:
- Add "Streaming Telemetry Modes" section to additional-visibility.rst
- Add StreamingTelemetryMode to opentelemetry.rst API reference
- Add 4 new generate hook classes to lifecycle.rst
- Add "Telemetry & Observability" section to streaming-actions.rst
- Add "Streaming Timing" section to tracking.rst
- Update monitoring.rst and examples/opentelemetry/README.md
- Update design doc to reflect final implementation

Example:
- Add --tracker flag to streaming_telemetry_modes.py for validating
  timing data in the Burr UI

Tests:
- 6 new tests covering StreamState defaults, timing accumulation,
  defensive noop, EndStreamModel backwards compat, and sync/async
  end-to-end with LocalTrackingClient

Report URL: https://github.com/apache/burr/actions/runs/22537869499

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