docs(README): add hero video — theme-aware cover linking to the 90-second overview on YouTube

[yinlianghui]

Self-contained spec — ready for any account/session with write access to this repo. All comments below are superseded by this body.

Goal

Surface the official 90-second overview film as the README hero visual: a theme-aware cover image that links to YouTube — the standard pattern for repos with a launch film (GitHub markdown does not render iframes, so a YouTube player cannot be embedded; a linked cover is the convention).

Video (already live): https://youtu.be/CX_FlOoOtr0 — "ObjectStack in 90 Seconds — Your Whole App, as Typed Metadata".

Steps (docs-only; no code, no changeset, no build)

1. Add two covers to docs/screenshots/:
   • hero-cover-dark.png and hero-cover-light.png (2400×1200 brand covers, ~400KB each).
   • Source: private repo steedos-labs/video-studio, files projects/2026-08-objectstack-hero-overview/covers/cover-en-dark.png and cover-en-light.png — rename on copy. (No access to that repo? The planner has both files ready to hand over, already renamed.)
2. Edit README.md: insert the block below immediately after the chips line (`Fits in an agent's context` · `Typed, validated, governed` · `Self-host anywhere` · Apache-2.0):

<p align="center">
 <a href="https://youtu.be/CX_FlOoOtr0">
 ````&lt;img src="docs/screenshots/hero-cover-dark.png#gh-dark-mode-only" width="900" alt="ObjectStack in 90 Seconds — watch the overview on YouTube"&gt;````
 ````&lt;img src="docs/screenshots/hero-cover-light.png#gh-light-mode-only" width="900" alt="ObjectStack in 90 Seconds — watch the overview on YouTube"&gt;````
 </a>
</p>

3. Open a PR for maintainer review (draft → ready).

Acceptance

• README shows the dark cover in dark mode, light cover in light mode (check both).
• Clicking the cover opens the YouTube video.
• No other README content changed.

Notes

• Cover text is verbatim from the README H1 quote block — no new marketing claims.
• Content compliance for the film itself (licensed Azure narration, platform AI disclosure) is already handled on the YouTube side.

[yinlianghui]

Claiming this issue. Session: session_01QADKScEsVzwfLBdiVAxYPp (Claude Code Remote, https://claude.ai/code/session_01QADKScEsVzwfLBdiVAxYPp). Branch: claude/video-studio-pm-handover-9pwabx (harness-designated branch for this session; docs-only change, worktree-first per AGENTS.md).

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[yinlianghui]

Status: change is ready; blocked on repo write access for the Claude GitHub App.

Empirical access check from this session: issues/comments ✅ · git push ❌ 403 · Git Refs API ❌ 403 ("Resource not accessible by integration") — so a PR cannot be opened from here until an org admin installs/authorizes the Claude GitHub App for objectstack-ai/objectstack (https://github.com/apps/claude/installations/select_target), or GitHub is reconnected from claude.ai settings. Once granted, the prepared commit will be pushed and a PR opened within minutes.

For anyone with write access who wants to apply it directly, the change is exactly:

1. Copy two covers into docs/screenshots/: hero-cover-dark.png + hero-cover-light.png (source: video-studio repo projects/2026-08-objectstack-hero-overview/covers/cover-en-{dark,light}.png, 2400×1200, ~400KB each).
2. In README.md, insert after the chips line (`Fits in an agent's context` · … · Apache-2.0):

<p align="center">
 <a href="https://youtu.be/CX_FlOoOtr0">
 ````&lt;img src="docs/screenshots/hero-cover-dark.png#gh-dark-mode-only" width="900" alt="ObjectStack in 90 Seconds — watch the overview on YouTube"&gt;````
 ````&lt;img src="docs/screenshots/hero-cover-light.png#gh-light-mode-only" width="900" alt="ObjectStack in 90 Seconds — watch the overview on YouTube"&gt;````
 </a>
</p>

Docs-only, no changeset.

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[yinlianghui]

Claim released — open for any session/account with write access to this repo.

Two corrections to my earlier comments:

1. The "blocked on the Claude GitHub App" status applies only to the session that filed this issue (its integration channel lacks push here). The task itself is not blocked: any account or Claude session that already has write access to this repo can execute it directly — the earlier claim comment (session session_01QADKScEsVzwfLBdiVAxYPp, branch claude/video-studio-pm-handover-9pwabx) is hereby released and should not stop anyone from taking this issue.
2. Asset access, clarified: the two covers live in the private repo steedos-labs/video-studio at projects/2026-08-objectstack-hero-overview/covers/cover-en-{dark,light}.png — anyone with access to that repo needs nothing else (rename to hero-cover-{dark,light}.png). No access there? The planner has both files on hand.

Everything needed to complete this issue is in the comments above (7-line HTML block + two PNGs). Docs-only, no changeset, no build.

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[os-zhuang]

Triage (Routine seat, hourly round): → pm:queue + domain:devx (+documentation), type Task.

Rationale: root README.md + docs/screenshots/ — devx lane; docs-only, no changeset, explicitly not a content/docs/releases/ touch. Dispatch note (blocking dependency inside the card): the two cover PNGs live in a private repo outside this fleet's authorization. The dev must obtain hero-cover-dark.png/hero-cover-light.png from the planner (the card says they are ready to hand over); if the assets are not obtainable in-session, stop and report rather than substituting anything. PR stays draft for maintainer review per the card's own acceptance.

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[os-steve]

Claim: devx lane PM seat, session e2eac1a7-8000-5c95-9749-38aec2ace6fc, branch claude/issue-11534-readme-hero-video.

Dispatching now. If you are a different session and you see this comment before starting work, this card is taken — pick another.

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