[Solstice] migration itests

[wjmelements]

Coverage Areas

The main actors changing are the miner actor and the reward actor.

• Reward actor: feat(fip0118): nv29 Solstice functionality and testing #13747
  • We need to get all the way through the contract layer
• Miner actor
  • SnapDeals would be covered here (see also [Solstice] Audit correctness of SnapDeal flow builtin-actors#1765).
• Some itests may also require updating or removal

Dependnencies

This requires the Solstice builtin-actors changes:

• [Solstice] f02 changes for reward split builtin-actors#1764
• [Solstice] Remove FIL+ and grant all new sectors 10x QAP builtin-actors#1762
• [Solstice] Provide pathway for existing sectors to upgrade to 10x QAP builtin-actors#1763

[rjan90]

@rvagg does filecoin-project/go-state-types#462 also cover the expected migrations itests outlined in this issue?

[rvagg]

#13747 has a ton of itests but nothing touching the miner actor yet, we'll want to add a bunch of those soon. Which argues for getting them on the same branch in builtin-actors, so we'll work toward a feature branch I think. The go-state-types PR has reward actor changes and a migration. I don't think there's anything we have to do specially for the miner actors in a migration but we'll probably need to be updating some miner details, like the new extend sectors method.

[BigLep]

For when we meet 2026-08-19:

1. Review the coverage areas
2. Understand the branch strategy

[BigLep]

Review the coverage areas

Issue description was updated.

Understand the branch strategy

builtin-actors, go-state-types, and lotus will have all changes in a branch for now