chore: release v0.8.140

[miguel-heygen]

Prepare v0.8.140 from current main, including the latest Studio host sizing change. Replaces the stale release cut.

Release notes cover all 26 pull requests merged since v0.8.139 in plain language. Package and plugin versions are updated together.

No visible change

This PR changes release metadata and documentation only. The features and fixes described in the notes are already on main.

Validation

• Release preparation completed on the current main commit with --no-tag.
• Compared the release notes against every merged pull request since v0.8.139.
• Removed the draft summary marker and style guidance from both release artifacts.
• Checked the diff for whitespace errors. No tag or publication was pushed.

[jrusso1020]

Release v0.8.140. Checked at this head:

• The branch is one commit on current main (merge-base = main tip 1e711b08), and the diff is version bumps plus the changelog only.
• 18 version fields go from 0.8.139 to 0.8.140, with nothing else in the JSON diff. The changed file set is identical to the v0.8.139 release commit (#5136): 13 packages, 5 plugin manifests, docs/changelog.mdx, releases/v0.8.140.md.
• git log v0.8.139..main has 26 squash-merged PRs, and the release notes and the changelog entry both list exactly those 26, with none missing and none extra.

— Rames

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[github-actions]

Edit accuracy: accurate 2059 (base branch 2059), smooth 1511 of those

The gate passes.
Smoothness is reported in the artifact, not gated. A case fails only if it fails 2 of 3 runs.

Quarantined, measured but not gated (0)