chore: rm dead code Reward struct

[LesnyRumcajs]

Reward struct is effectively dead code. In theory in the public API... but

• Without any tests (and some unsound logic)
• The only consumer is (AFAIK) Forest's versioned fork of actors...
• ... which Forest doesn't even use.

I don't think it was ever used anywhere.

[Copilot]

Pull request overview

Removes the unused Reward/VestingFunction types from the reward actor crate, reducing dead public API surface area that appears to have no in-repo consumers.

Changes:

• Deleted the Reward struct and VestingFunction enum from actors/reward/src/state.rs.
• Removed the public re-export of those types from actors/reward/src/lib.rs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
actors/reward/src/state.rs	Removes the unused Reward/VestingFunction definitions and related imports.
actors/reward/src/lib.rs	Stops re-exporting the removed types from the crate’s public API.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.58%. Comparing base (6094683) to head (47e5b87).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1777      +/-   ##
==========================================
+ Coverage   90.55%   90.58%   +0.02%     
==========================================
  Files         140      140              
  Lines       27814    27805       -9     
==========================================
  Hits        25186    25186              
+ Misses       2628     2619       -9     

Files with missing lines	Coverage Δ
actors/reward/src/lib.rs	84.48% <ø> (ø)
actors/reward/src/state.rs	94.73% <ø> (+12.91%)	⬆️

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