docs(changelog): add new entries from changelog

[windmill-internal-app]

This PR adds new changelog entries.

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Summary by cubic

Added the latest changelog entry to the sidebar: "Kubernetes autoscaling scale-in prefers idle worker pods" (2026-06-10) with a link to the post.

^{Written for commit bc7c5fb. Summary will update on new commits.}

[cloudflare-workers-and-pages]

Deploying windmill with    Cloudflare Pages

Latest commit:	bc7c5fb
Status:	⚡️  Build in progress...

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[github-actions]

Pi Review

Good to merge — this is a straightforward data-only addition of a new changelog entry, following the exact same pattern as all existing entries in the file.

Summary

The PR adds one entry to frontend/src/lib/components/sidebar/changelogs.ts:

• Label: "Kubernetes autoscaling scale-in prefers idle worker pods"
• Date: 2026-06-10
• Href: https://www.windmill.dev/changelog/k8s-scale-in-pod-deletion-cost

The entry is placed at the top of the array, consistent with reverse-chronological ordering (it is the newest entry). The structure, field names, and formatting match all 81 existing entries exactly.

No new code, no new public surfaces, no logic changes. No issues found.

Test coverage

CI / workflows / docs / config-only — no automated tests expected. The change is purely a static data entry addition with no in-app surface to exercise beyond the changelog sidebar rendering (which is a trivial data-consistency check).

[github-actions]

Codex Review

cc @windmill-internal-app[bot]
Mergeable, but should ideally address nits: broken changelog link

Found 1 issue:

1. [P2] The newly added changelog entry points to a URL that currently returns HTTP 404, so users clicking it from the sidebar will land on a broken page. I verified https://www.windmill.dev/changelog/k8s-scale-in-pod-deletion-cost with curl -I -L and it returns 404.
   frontend/src/lib/components/sidebar/changelogs.ts:10

Test coverage

No automated tests are expected for this changelog-only data update. Manual verification should confirm the sidebar changelog link opens the intended published changelog page before merge.