* feat(routing): group requests by session with names and estimated costs
* fix(routing): address session view review feedback
Preserve Luna Reserve and other header fallbacks for ordinary Codex turn metadata; reuse metadata and the kind across trace and native accounting. Default to By request and persist the grouping choice. Store only token accounting fields in route history while retaining legacy JSON compatibility.
Add regressions for helper precedence, native kind accounting, history compatibility and grouping preferences.