Migrate Stride to opt-in PSS

**SUMMARY:** Stride moves from ICS Top-N (95%) to an **opt-in PoA-style** model with **7 equal-weight validators**, and control of ICS config shifts from **Hub governance** to a **Stride Association multisig**. Fees will pay those 7 validators directly. **Why** * ICS is being sunset (planned 2026) and doesn't cover validator costs. * Current flow sends revenue to stakers; validator commissions are negligible. **What changes (Hub)** * Submit `MsgUpdateConsumer` to: * Set new owner = Stride Association multisig. * `topN: 0` (opt-in), `validatorSetCap: 7`, `validatorsPowerCap: 1`. * Allowlist the 7 validators. **Validators (7)** * Imperator, Polkachu, Stakecito, Keplr, Cosmostation, Lavender.Five, Citadel.One. **Follow-on (Stride)** * Redistribution 85% → **100%**. * **Pay fees directly** to the 7 validators' fee addresses. **Forum**: https://forum.cosmos.network/t/migrate-stride-to-opt-in-pss/16241