chore: bump eth.zig to v0.9.1, release 0.6.1

[lukemacauley]

Bumps eth.zig v0.9.0 -> v0.9.1, which adds HttpTransport.lastFailure() diagnostics for transport-level failures (StrobeLabs/eth.zig#115, from the 2026-08-19 gator liquidator incident).

gator-liquidators pins both this SDK and eth.zig directly; two different eth.zig instances collide at link time (duplicate blst symbols), so its eth.zig bump has to move through an SDK release first. Plan: merge this, tag v0.6.1, then bump both pins in gator-liquidators (its feature-detected diagnostics branch activates on that bump).

Tests: 103/103 pass against v0.9.1.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added diagnostics to help identify the most recent HTTP transport failure.

• Updates

  • Updated the package to version 0.6.1.
  • Upgraded the eth.zig dependency to v0.9.1.
  • Consumers must pin a compatible eth.zig version.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

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Run ID: 5ccbfc27-2908-4988-987c-460d7fa01fcc

📥 Commits

Reviewing files that changed from the base of the PR and between 77c1314 and 2a22f84.

📒 Files selected for processing (2)

• CHANGELOG.md
• build.zig.zon

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📝 Walkthrough

Walkthrough

The package version is now 0.6.1. The eth.zig dependency is upgraded to v0.9.1. The changelog records the dependency update, transport diagnostics, and matching-version requirement.

Changes

Package release

Layer / File(s)	Summary
Version and dependency release metadata build.zig.zon, CHANGELOG.md	The package version is updated to 0.6.1. The eth dependency is upgraded to v0.9.1 with new commit and hash values. The changelog documents the release changes.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 2a22f

This is a localized dependency and release-notes update with the test suite reported passing; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: koko1123

🚥 Pre-merge checks | ✅ 5

✅ 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 clearly summarizes the eth.zig dependency upgrade and the 0.6.1 release preparation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-eth-zig-0.9.1

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