- Add `feeDestinationLocked` bool to LiquidityManager
- Replace one-shot setter with conditional trapdoor: EOAs may be set
repeatedly, but setting a contract address locks permanently
- Remove `AddressAlreadySet` error (superseded by the new lock mechanic)
- Replace fragile SLOT7 storage hack in red-team.sh with a proper
`setFeeDestination()` call using the deployer key
- Update tests: replace AddressAlreadySet test with three new tests
covering EOA multi-set, contract lock, and locked revert
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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