chore: update known blocks

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• updated known blocks

Reference issue to close (if applicable)

Closes #6127

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.

Summary by CodeRabbit

• Chores
  • Added new known block checkpoints for calibnet (height 3,024,000) and mainnet (height 5,356,800), improving bootstrap speed and chain verification.
  • Maintains existing mappings; no behavioral changes required from users.
  • This update helps nodes recognize recent finalized blocks and may reduce sync time.
  • Applies automatically after upgrade; no configuration changes needed.

[coderabbitai]

Walkthrough

Adds two checkpoint mappings to build/known_blocks.yaml: calibnet at epoch 3024000 and mainnet at epoch 5356800, each mapped to specific CID values. No other structure or logic changes.

Changes

Cohort / File(s)	Summary
Checkpoint updates build/known_blocks.yaml	Added calibnet 3024000 → bafy2bzacebc3obhbqtb5375alsxaqyypjsh4ho3fqq5baspzblw7tewryfqb6 and mainnet 5356800 → bafy2bzacecjskrcifcteuotqxwq5u5e7ol6z4zejqafn2ycco4abttt3vqmgy; no other edits

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related issues

• cron: update known_blocks.yaml #6016 — Also updates build/known_blocks.yaml with new checkpoint mappings; same file and change pattern.
• cron: update known_blocks.yaml #5884 — Prior checkpoint updates to build/known_blocks.yaml; directly related by file and purpose.

Possibly related PRs

• chore: update known blocks #6017 — Updates build/known_blocks.yaml with different epoch checkpoints; same file and change type.
• chore: update known blocks #5887 — Earlier PR adding checkpoint mappings in build/known_blocks.yaml; closely related update.

Suggested reviewers

• elmattic
• hanabi1224
• akaladarshi

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly communicates the update to known_blocks.yaml by signifying a maintenance task with the “chore” prefix and specifying the change to known blocks. It aligns with the content of the pull request and contains no extraneous information.
Linked Issues Check	✅ Passed	The pull request fulfills the objectives of issue #6127 by updating build/known_blocks.yaml with the latest checkpoints for both mainnet and calibnet as generated by the prescribed forest-tool process. These additions match the expected checkpoint mappings and improve snapshot loading performance as intended. No additional coding requirements were specified, so the changes meet the issue criteria.
Out of Scope Changes Check	✅ Passed	Only build/known_blocks.yaml was modified, and no other files or code paths were altered. There are no unrelated changes outside the scope of updating known blocks, so the pull request does not introduce out-of-scope modifications.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch shashank/#6127

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📜 Recent review details

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Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 150ac09 and 145e401.

📒 Files selected for processing (1)

• build/known_blocks.yaml (2 hunks)

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• GitHub Check: tests
• GitHub Check: tests-release
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