Balance analytics

2026-10-21, Release notes

Players: no visible change.
Owner: a new read-only balance export, /ops/analytics/export and /ops/analytics/summary, with its own WOW_ANALYTICS_TOKEN. Runs now record why heroes lose health and die: damage taken by source, what the class guard prevented, and each death's cause with the 10 seconds before it. See docs/ANALYTICS.md.