feat: nv28 skeleton

[rjan90]

Related Issues

Closes #13362

Proposed Changes

Create network skeleton for nv28.

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title conforms with contribution conventions
• Update CHANGELOG.md or signal that this change does not need it per contribution conventions
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green

[Copilot]

Pull Request Overview

This PR implements the network skeleton for NV28 (network version 28), adding actor version 18 support throughout the Lotus codebase. The changes prepare the system for the upcoming network upgrade by updating dependencies, adding new actor implementations, and configuring upgrade parameters.

Key changes:

• Updates go-state-types dependency from v0.17.0 to v0.18.0-dev
• Adds actor version 18 implementations for all built-in actors
• Configures network version 28 upgrade parameters across different network environments

Reviewed Changes

Copilot reviewed 87 out of 89 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
go.mod / go.sum	Updates go-state-types dependency to v0.18.0-dev
gen/inlinegen-data.json	Adds actor version 18 and network version 28 to generation configuration
chain/actors/version.go	Updates latest version constants to version 18
chain/actors/builtin/*/v18.go	Implements v18 actor state wrappers for all built-in actors
chain/consensus/filcns/upgrades.go	Adds UpgradeActorsV18 migration functions
build/buildconstants/params_*.go	Configures UpgradeXxHeight for different networks
documentation/en/*.md	Updates API documentation with network version 28 examples
build/builtin_actors_gen.go	Adds actor bundle metadata for version 18 across all networks

Comments suppressed due to low confidence (2)

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[rjan90]

Sanity test run in devnet:

Network version at the start of the devnet:

lotus state actor-cids
Network Version: 27
Actor Version: 17
Manifest CID: bafy2bzaceasvgkke3j4cs3xsxnjswpcdmokkvkiehzxzcgfox3ozlehimbuqk

The pre-migration is happening:

2025-10-20T16:55:13.045+0200    WARN    statemgr        stmgr/forks.go:250      STARTING pre-migration
2025-10-20T16:55:13.046+0200    INFO    bundle  bundle/bundle.go:60     manifest cid: bafy2bzaceasvgkke3j4cs3xsxnjswpcdmokkvkiehzxzcgfox3ozlehimbuqk
2025-10-20T16:55:13.047+0200    INFO    fil-consensus   filcns/upgrades.go:3505 Started 5 workers
2025-10-20T16:55:13.048+0200    INFO    fil-consensus   filcns/upgrades.go:3505 Creating migration jobs
---
2025-10-20T16:55:13.049+0200    WARN    statemgr        stmgr/forks.go:263      COMPLETED pre-migration {"duration": 0.003363333}

The migration at epoch 200:

025-10-20T17:03:19.054+0200    WARN    statemgr        stmgr/forks.go:202      STARTING migration      {"height": "200", "from": "bafy2bzaceagc4hccfx55pim3fgtra5kkf2v5yelqkcaye757kzrr6w4sfv6gs"}
2025-10-20T17:03:19.055+0200    INFO    bundle  bundle/bundle.go:60     manifest cid: bafy2bzaceasvgkke3j4cs3xsxnjswpcdmokkvkiehzxzcgfox3ozlehimbuqk
-------
2025-10-20T17:03:19.058+0200    WARN    statemgr        stmgr/forks.go:211      COMPLETED migration     {"height": "200", "from": "bafy2bzaceagc4hccfx55pim3fgtra5kkf2v5yelqkcaye757kzrr6w4sfv6gs", "to": "bafy2bzaceagc4hccfx55pim3fgtra5kkf2v5yelqkcaye757kzrr6w4sfv6gs", "duration": 0.004379625}

We switch actors-bundle version and network version:

lotus state actor-cids               
Network Version: 28
Actor Version: 18
Manifest CID: bafy2bzaceasvgkke3j4cs3xsxnjswpcdmokkvkiehzxzcgfox3ozlehimbuqk

NB: Manifest CID is the same as actor version 17 since we are reusing that bundle for the nv28 skeleton.

The network is progressing after the upgrade epoch:
lotus chain list

218: (Oct 20 17:04:25) [ bafy2bzacecw2cakddyn35jl54nkpig7kdpznvxpzkpe6cnynhk7yhjln6xzka: t01000, ]
219: (Oct 20 17:04:29) [ bafy2bzacedimcnldzqqbaze4dqxwubg57pyjgkldxry47ivleifcoktvdjrao: t01000, ]
220: (Oct 20 17:04:33) [ bafy2bzacebk3gregdfkpbo7uyjzpl5dem32xrycwjfo7lj2lze6dg6swhrask: t01000, ]
221: (Oct 20 17:04:37) [ bafy2bzaced77gxsupkkemmzjp3iqklbpfbdgeh3dr7w55fct6ux62ap64hzhc: t01000, ]
222: (Oct 20 17:04:41) [ bafy2bzacealfhwt6c4qlxjbvjdoej6qipufkpi7z66wv6fd7h7ktvtzkpkhpk: t01000, ]
223: (Oct 20 17:04:45) [ bafy2bzacebvr7k5z6yoxcsc5pfai5ahjusix54t6bcwaaqlarphrd66be3wxy: t01000, ]
224: (Oct 20 17:04:49) [ bafy2bzacedgskiwoq3lkddvlikivhsiqf635gohylc5f5l64o2qryhoyisy5i: t01000, ]
225: (Oct 20 17:04:53) [ bafy2bzaceajqr6rx5o77si4kg7eccp5bsjtbrj4lod32wqml6rkpzkrqbpdoc: t01000, ]
226: (Oct 20 17:04:57) [ bafy2bzacedgy4qu73wedzvyiupahpqznui532kxiybgxlrrsnq5cletnwzfe4: t01000, ]