chore: prepare nv28 calibnet upgrade

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• prepared NV28 upgrade for calibnet

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• New Features
  • Added support for the NV28 "FireHorse" network upgrade on Calibnet, Butterflynet, and Devnet, with activation scheduled for epoch 3,694,534 (May 7, 2026 at 14:00:00 UTC).

[coderabbitai]

Walkthrough

This pull request implements NV28 "FireHorse" network upgrade support for Calibnet by configuring the activation epoch (3,694,534), actor bundle versions (v18.0.0), manifest entries, and migration handlers to enable the network upgrade.

Changes

Cohort / File(s)	Summary
Documentation CHANGELOG.md	Added entry documenting NV28 "FireHorse" upgrade support for Calibnet with activation epoch and timestamp.
Network Configuration & Manifest build/manifest.json, src/networks/actors_bundle.rs, src/networks/calibnet/mod.rs	Added manifest record for calibnet v18.0.0 with new content identifiers and actor CIDs; extended actor bundles list with calibrationnet v18.0.0 bundle URLs; updated HEIGHT_INFOS for FireHorse from placeholder epoch to concrete activation epoch 3,694,534.
Migration Wiring src/state_migration/mod.rs	Registered Height::FireHorse migration handler mapping to nv28::run_migration for Calibnet, Butterflynet, and Devnet networks.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• feat: nv28 base migration #6921: Directly wires Height::FireHorse to nv28::run_migration migration handler for the upgrade.
• feat: nv28 support for devnet #6943: Implements similar NV28 (FireHorse) support infrastructure for devnet network.
• feat: NV27 butterflynet #6047: Implements network upgrade registration pattern for different upgrade (NV27) on alternate network.

Suggested labels

Release

Suggested reviewers

• hanabi1224
• akaladarshi
• sudo-shashank

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The PR title 'chore: prepare nv28 calibnet upgrade' accurately summarizes the main change: preparing the Calibnet network for the NV28 (FireHorse) upgrade across multiple configuration files and migration logic.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch calibnet-nv28-upgrade

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch calibnet-nv28-upgrade

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.11%. Comparing base (6d1789f) to head (424ef66).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/networks/actors_bundle.rs	90.30% <100.00%> (-0.40%)	⬇️
src/networks/calibnet/mod.rs	100.00% <100.00%> (ø)
src/state_migration/mod.rs	81.11% <100.00%> (+0.21%)	⬆️

... and 7 files with indirect coverage changes

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