chore(release): open dev at 2.60.0 before releasing 2.59.0

[github-actions]

Summary

2.59.0 is about to be released. Merging this first means dev already outranks the new tag when it lands, so neither dev nor any open pull request ever inherits the version-line failure. release.yml refuses to publish until this has merged.

This moves dev to 2.60.0.

Opened automatically by .github/workflows/dev-version-bump.yml. The same
version-line move was previously done by hand in 32529c2, e4a85d1, 076ad30, and
befcac3.

Verification

The workflow proved 2.59.0 has neither a Git tag nor an npm publication, and bun test tests/ci-workflows/release-version-line.test.ts proved the chosen development version is unused.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

Review readiness checklist

This PR stays in draft until every box below is ticked. Tick all four boxes once the requirements are met:

• All CI tests are green on my local testing.

• I pushed my PR to the latest dev commit.

• I resolved all correct Codex and CodeRabbit findings.

• My PR is ready for review.

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[github-actions]

⏳ DRAFT

• review readiness checklist open (0/4 boxes ticked).

What to do

• Tick all four boxes in the PR description once you're done (currently 0/4).

Review readiness checklist

• ⬜ All CI tests are green on my local testing.
• ⬜ I pushed my PR to the latest dev commit.
• ⬜ I resolved all correct Codex and CodeRabbit findings.
• ⬜ My PR is ready for review.

0/4 boxes ticked.

Automatic draft conversion failed. Please convert this pull request to a draft manually until every box above is ticked.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-18T16:26:49.793326Z	f37e5e4	Draft marked ready

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