fix: add missing Ignition dependency for HorizonStaking

[MoonBoi9001]

Motivation

During local-network testing with fresh contract deployments, HorizonStaking deployment intermittently fails with GraphDirectoryInvalidZeroAddress("GraphToken"). The failure is nondeterministic -- it depends on the order Ignition schedules module execution.

Summary

HorizonStaking's constructor extends GraphDirectory, which queries the Controller for GraphToken, EpochManager, RewardsManager, and other periphery contracts. These addresses are registered in the Controller by GraphPeripheryModule. Without an explicit after dependency, Ignition may schedule HorizonStaking before the periphery registrations complete, causing the constructor to read address(0) and revert.

Every other core module (GraphPayments, PaymentsEscrow, GraphTallyCollector, RecurringCollector) already declares { after: [GraphPeripheryModule, HorizonProxiesModule] }. HorizonStaking was the only one missing it.

The fix adds the same dependency declaration to HorizonStaking.ts. This only affects fresh deployments (new chains, testnets, local environments) -- on mainnet, the Controller already has all addresses registered so the ordering is irrelevant.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.58%. Comparing base (7b34ae0) to head (d3fc44f).

Additional details and impacted files

@@                      Coverage Diff                      @@
##           mde/dips-ignition-deployment    #1305   +/-   ##
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  Coverage                         81.58%   81.58%           
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  Files                                47       47           
  Lines                              2644     2644           
  Branches                            787      787           
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  Hits                               2157     2157           
  Misses                              487      487           

Flag	Coverage Δ
unittests	81.58% <ø> (ø)

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