Stellar Index v0.21.10

[v0.21.10] — 2026-08-01

Fixed

• v0.21.9's deploy was blocked by the migration rollback-safety gate
  on 0124's CHECK rebuild (rule 9). The change is a pure enum widening
  — every value an old binary writes remains valid — now annotated
  migration-compat:ok inline. No code changes vs v0.21.9.