v2026.08.01-beta13

Gargoyle firmware built from ispyisail/gargoyle@2eaf14d (ref: 2eaf14da4000b1274b529cd8b903fef4d51a19b3, channel: testing)

Changes since v2026.07.31-beta12

• gargoyle-firewall-util: fix weekly-range rules never loading into nftables
• restrictions: family-time wizard fixes (inline groups, weekly-range scheduling)
• known-devices: add Device Groups management (add/edit/delete, multi-group)