relay-eval dashboard: vertical legend with profile links, run-by column
- operator legend uses 3-column grid (no more horizontal overflow)
- all operator names link to bsky.app profiles
- added "run by" column to coverage table with linked names
- follows Pulsar's pattern: @handle → bsky.app/profile/handle
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>