feat: update forest-cli snapshot export to use v2 format by default

[hanabi1224]

Summary of changes

@ADobrodey please help confirm this change does not break any infra services and scripts. It'd be great to specify --format everywhere

Changes introduced in this pull request:

Reference issue to close (if applicable)

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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

• New Features

  • Snapshot export now defaults to the V2 format, affecting exports that don't explicitly set a format.
  • Export progress output is clearer, showing the version (e.g., v2) and the destination path during runtime.

• Chores

  • Updated default snapshot export configuration to the latest format.
  • Improved runtime message formatting for export operations.

[coderabbitai]

Walkthrough

Default snapshot export format switched from V1 to V2 in the CLI snapshot export command. The user-facing progress message was updated to include an explicit "v{version}" prefix and the destination path. No control-flow, type, or API signature changes.

Changes

Cohort / File(s)	Summary
Snapshot export CLI options src/cli/subcommands/snapshot_cmd.rs	Changed default format from FilecoinSnapshotVersion::V1 to FilecoinSnapshotVersion::V2; updated progress message to include v{version} and the destination path.
Changelog CHANGELOG.md	Added note under "Forest unreleased > Changed" documenting that forest-cli snapshot export now defaults to v2 format (PR #6145).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: print average speed in forest-cli snapshot export #5869 — Modifies progress reporting for snapshot export (adds average speed) in the same CLI export command area.
• feat: allow export spine-only snapshots with forest-cli snapshot export -d 0 #6097 — Also updates the CLI snapshot export command (changes to depth/defaults), touching nearby export logic.

Suggested reviewers

• elmattic
• sudo-shashank

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly describes the primary change of updating the default snapshot export format of forest-cli to v2, clearly reflecting the main purpose of the pull request and following a concise, conventional commit style without irrelevant details.
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 hm/snapshot-export-v2-by-default

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

src/cli/subcommands/snapshot_cmd.rs (1)

42-42: Approve V2 as default snapshot format

• Confirmed V2 is production-ready and now the recommended default (NV27/F3, Lotus defaults).
• Only scripts/tests/snapshot_parity/docker-compose.yml relies on default; both forest-cli and lotus now default to v2, so parity tests pass unchanged.
• No other hardcoded V1 defaults detected.
• Optional: update documentation or tests to explicitly reference v2 default.

📜 Review details

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Reviewing files that changed from the base of the PR and between b07bd5b and f61c5d1.

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• src/cli/subcommands/snapshot_cmd.rs (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (7)

• GitHub Check: tests-release
• GitHub Check: tests
• GitHub Check: Build forest binaries on Linux AMD64
• GitHub Check: All lint checks
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• GitHub Check: Build Ubuntu
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🔇 Additional comments (1)

src/cli/subcommands/snapshot_cmd.rs (1)

137-137: FilecoinSnapshotVersion can be safely cast to u64.

It’s already serialized with *self as u64 and deserialized via from_u64, so including format as u64 in the progress message is correct.