Release 0.20260612.4 — SH-3, proxy TTL, Sandstorm SH-6/SH-7 - ETHERCALC_ROOM_CREATE_LIMIT per-IP cap on room-minting routes - Proxy compose defaults: 30-day ETHERCALC_EXPIRE, room-create limit on - Sandstorm: viewer role enforced via ETHERCALC_SANDSTORM; migrate token disarmed after first-load in run_grain.sh - Helm config.roomCreateLimit wiring; sandstorm appVersion 202606124