Documents the review of all fork changes since upstream divergence,
the two defects fixed (broken swift.yml CI workflow, over-aggressive
speed-index segment cap), and the areas verified as correct.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013DNqCsHShA4yNqgZ6ZZQy3
