Recover IBC Client: Cosmos Hub ↔ Bostrom (07-tendermint-764)

Recover expired IBC light client 07-tendermint-764 which tracks the Bostrom chain (bostrom). This client is required for IBC channel channel-341 (Cosmos Hub) ↔ channel-8 (Bostrom) to function. Client parameters: trusting_period=518400s, max_clock_drift=60s, trust_level=1/3, unbonding_period=691200s. The Bostrom team has already submitted governance proposals on the Bostrom side (#57) to recover the corresponding Bostrom-side client (07-tendermint-15 tracking cosmoshub-4). Once both sides are recovered, the existing channel will be fully operational — no new channels needed. Affected denoms: uatom on Bostrom (via channel-8), boot on Cosmos Hub (via channel-341). Bostrom RPC: https://rpc.bostrom.cybernode.ai Bostrom LCD: https://lcd.bostrom.cybernode.ai GitHub: https://github.com/cybercongress