chore: release v0.8.51

[vanceingalls]

Release v0.8.51

Merging this PR publishes npm and cuts the GitHub release — the workflow creates the tag from the merge SHA, so the local tag is not pushed.

98 commits since v0.8.50. Patch bump: nothing here changes a public contract (data-* attributes, CLI flags, SDK API).

Headline

• Speed ramps, end to end — a rate lane in data-automation (feat(core): speed ramps as a rate lane in data-automation #4129) that renders with the same source-time mapping as the preview (feat(engine): render speed ramps with the same source-time mapping as the preview #4143).
• Composition length from clips — a composition with no authored length now derives it, backed by one shared resolver for video, audio and image (feat(core): a composition with no authored length takes it from its clips #4174, feat(core): video, audio and image length come from one shared resolver #4166).
• hyperframes timeline — prints a project's tracks and clips from the CLI (feat(cli): hyperframes timeline prints a project's tracks and clips #4138), listing every clip of a kind flat, nested ones included (fix(cli): timeline lists every clip of a kind once, nested included #4173).

Also notable

• Runtime: a finished film rests on its last frame instead of a blank one (fix(runtime): a finished film rests on its last frame instead of a blank one #4158)
• Studio: snap guide and dragged-edge frame while trimming (feat(studio): trimming a clip shows the snap guide and the frame at the dragged edge #4163); dropping an asset between rows opens a new row (fix(studio): dropping an asset between or above timeline rows opens a new row #4160); Lint badge pulses on an error finding (feat(studio): the Lint badge pulses while an error finding exists #4152)
• Studio: Tailwind CSS v4 (feat(studio): upgrade Studio to Tailwind CSS v4 #3618) and every design value in one theme file (feat(studio): move every design value into one theme file #3621) — internal styling, Studio is a served app
• Producer: disk capture stops early when frames cannot fit (fix(producer): stop disk capture early when frames cannot fit on disk #4164); dead browser tab retried once on single-worker capture (fix(producer): retry a dead browser tab once on the single-worker capture path #4162)
• Engine: audio source-not-found names the file and shares one src resolver with lint (fix(engine): audio source-not-found names the file and shares one src resolver with lint #4172)
• Lint: video and audio take length from the file; only img needs data-duration (fix(lint): video and audio take their length from the file, only an img needs data-duration #4154)

SDK cutover watch window

Still open — started 2026-09-18 with the v0.8.47 flip. Both rollback conditions remain green on released versions: 0 sdk_cutover_failed, 0.0% resolver-shadow divergence.

This release carries the read-reason diagnostic (#4161) that feeds it: stage: read was the largest remaining class of SDK-session failures and a single opaque string. It now names the branch — unsafe_path, http_error (+status), missing_content, absent_or_empty — and the dashboard tile was updated to break out reason so the granularity actually surfaces.

🤖 Generated with Claude Code

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated
hyperframes	🟢 Ready	View Preview	Sep 19, 2026, 3:53 PM

💡 Tip: Enable Automations to automatically generate PRs for you.