[SrMessiSOL]

Summary

• retain alliance membership PDAs after leave or expulsion and mark them inactive
• reactivate retained memberships instead of recreating claim history
• preserve current-period mission masks when rejoining the same alliance
• reset masks when joining a different alliance
• reject alliance actions from inactive memberships
• add regression tests for same- and different-alliance reactivation

Verification

• cargo test --lib --manifest-path programs/game-state/Cargo.toml
• 41 tests passed

Compatibility

• no account resize or migration
• requires the companion frontend PR to hide role-0 memberships