Fixes RUSTSEC-2026-0387 (timing variability in crypto-bigint's constant-time operations) for both copies in Cargo.lock:
- crypto-bigint 0.7.5 → 0.7.6 (g1t's security update).
- crypto-bigint 0.5.5 is gone: p256 0.13 in
services/identityheld it, and 0.14 builds on crypto-bigint 0.7. ES256 verification insso/jwt.rsbuilds against 0.14 with no code changes. All 236 identity tests pass, and it checks for wasm32.