docs(release): mark v2.19.9 release date

[miclle]

变更内容

• 将 CHANGELOG.md 中 2.19.9 (unreleased) 标记为 2.19.9 (2026-06-30)

验证

• git diff --check
• go test ./iqshell/sandbox/... ./cmd_test/...

Release

合并后创建 GitHub Release v2.19.9，Release notes 使用 CHANGELOG 中 2.19.9 条目。

[qiniu-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: miclle
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[gemini-code-assist]

Code Review

This pull request updates the release date for version 2.19.9 in the CHANGELOG.md file from 'unreleased' to '2026-06-30'. There are no review comments, and I have no feedback to provide.

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[fennoai]

No issues found in this review. I reviewed the changelog-only release-date update across code quality, performance, security, and documentation accuracy; no inline findings were identified.

[miclle]

/lgtm

[qiniu-prow]

@miclle: you cannot LGTM your own PR.

Details

In response to this:

/lgtm

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