fix: restore GelatoAutomation contract (#46)

[Tranquil-Flow]

Summary

• Restores the entirely commented-out GelatoAutomation.sol with proper AbstractAutomation inheritance
• Implements Gelato resolver/executor interface: checker() returns readiness + encoded payload, execute() triggers distribution
• Marks unused execData parameter correctly via /* execData */
• Adds comprehensive test coverage: checker true/false states, permissionless execute, revert when not ready, all distribution condition combinations

Closes #46

Test plan

• testGelatoChecker — returns false initially, true after blocks advance
• testGelatoExecute — executes distribution via Gelato executor
• testGelatoExecutePermissionless — random address can call execute safely
• testGelatoExecuteRevertsWhenNotReady — reverts with NotResolved
• testGelatoCheckerFalseWhenNotReady — all false conditions tested (no votes, low yield, disabled)
• testGelatoCheckerTrueWhenReady — verifies execPayload encodes executeDistribution selector
• Full suite: 191 tests pass