release: cut v2026.8.3

[ryw]

Release notes for v2026.8.3, covering the 12 commits on main since v2026.8.2.

CHANGELOG.md is the source; docs/src/content/docs/changelog.md (pnpm -C docs gen:project) and web/src/lib/docs-content.ts (pnpm -C web gen:docs) are regenerated from it in this commit.

Contents

• Fixed — dashboard render time (perf(dashboard): throttle GitHub scan, roll up run bands in SQL #389): the blocking GitHub improvement scan is now concurrent, capped at 8 in-flight PR fetches, and throttled to once a minute per workspace; the 30-day activity chart run-length-encodes in SQL instead of shipping one row per run to the web tier.
• Changed — CI fails a PR when two migrations share a version number (ci: fail checks on duplicate migration version numbers #386), the defect behind v2026.8.1.
• Dependencies — 9 routine Dependabot bumps, summarized in one line per the convention used in earlier entries rather than enumerated.

Note for the reviewer

The throttle in #389 is a user-visible freshness change: improvement PR state can now be up to a minute stale, so a just-merged PR takes that long to show as Merged. It's called out in the changelog entry and in improvements.md. If you'd rather that not ship to customers, hold this PR — the tag is what publishes images.

Once merged, v2026.8.3 gets tagged on the merge commit, which triggers Release images (GHCR build + cosign signing + Trivy scan, moves latest) and the automated compose.release.yaml pin bump.

Want tembo to make any changes? Add a comment with @tembo and i'll get back to work!

    

[Copilot]

Pull request overview

Cuts release v2026.8.3 by adding the new release entry to the canonical CHANGELOG.md, then regenerating the published docs changelog page and the in-app docs bundle so all three surfaces stay in sync for this release.

Changes:

• Add v2026.8.3 release notes (dashboard perf fixes + duplicate-migration CI guard + dependency summary) to CHANGELOG.md.
• Regenerate docs/src/content/docs/changelog.md from CHANGELOG.md for the published docs site.
• Regenerate web/src/lib/docs-content.ts from the docs content so the in-app /docs matches.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
CHANGELOG.md	Adds the v2026.8.3 release entry (source of truth).
docs/src/content/docs/changelog.md	Mirrors the new v2026.8.3 entry for the published manual.
web/src/lib/docs-content.ts	Updates the bundled in-app docs content to include v2026.8.3.

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