- [x] Implement `GET /api/v1/genlockes/{id}/graveyard` — query all encounters with status "fainted" across all runs linked to the genlocke's legs, include leg/game context per entry
- [x] Add summary stats to the response: total deaths, deaths per leg, deadliest leg
- [ ] Indicate whether each dead Pokemon was a transferred Pokemon or caught fresh (join with GenlockeTransfer) — deferred until GenlockeTransfer model exists (nuzlocke-tracker-lsc2)
- [x] Build the cumulative graveyard component: list of dead Pokemon with sprite, nickname, species, leg/game, death cause, level