ci: bump GitHub Actions to latest versions

[jnasbyupgrade]

Bump actions/checkout to the latest published major version to clear the Node.js 20 deprecation warnings it was triggering in CI logs.

• actions/checkout@v6 -> actions/checkout@v7

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[github-actions]

Claude finished @jnasbyupgrade's task in 1m 2s —— View job

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Claude finished the review

• Gather context (PR diff, changed files)
• Review each workflow file change
• Verify version bump correctness (checkout v6→v7)
• Post final review

Review

This is a clean, mechanical change: actions/checkout@v6 → actions/checkout@v7 across all 12 usages in the three workflow files (ci.yml, claude-code-review.yml, claude.yml). A few checks:

• Consistency: every one of the 12 actions/checkout@v6 references in the repo was updated — no stragglers left on v6.
• Scope: actions/checkout is the only pinned-major-version action used in these workflows, so there's nothing else to bump here.
• No behavior change: none of the surrounding with: blocks (fetch-depth, persist-credentials, etc.) were touched, so this is a pure version bump with no config changes.
• CI confirms it works: the CI run on this branch (30952741648) already completed successfully, so actions/checkout@v7 resolves and behaves as expected across all jobs (including the matrix jobs and the all-checks-passed gate).
• Naming: per this repo's CLAUDE.md, since this change touches only CI files, the CI: PR-title prefix convention doesn't strictly apply to the PR title itself (that convention is for commit/PR subjects) — worth double-checking whether the maintainer wants the title prefixed as CI: bump GitHub Actions to latest versions for consistency with prior commits like 34ead59. Not a blocker either way.

No functional issues found. This looks safe to merge.