feat(marketing): refresh observability screenshots for product pages

[NicholasKissel]

Replaces the observability screenshots on the product pages with captures of an agent-built app pipeline running in the Rivet dashboard (the examples/agent-factory example in rivet-dev/rivet: Actors + agentOS + Workflows + Dynamic Apps).

Page(s)	Before	After
/, /actors, /enterprise	rivet-actor-inspector.png (Chat Room State tab)	rivet-actors-inspector-state.png — project Actor State: build summary + per-step attempts/timings
/dynamic-apps	rivet-actor-inspector.png	rivet-dynamic-apps-release.png — appRelease Actor State: active release, publish history with hashes, request counter
/workflows	blog inspectorworkflow.png	rivet-workflows-inspector.png — buildPipeline workflow graph (plan → provision → checkpoint → write → verify → publish → smoke-test) with publish selected

All three are 2944×2202 PNGs (2× capture in a dark rounded bezel on a transparent canvas, matching the current image's framing but without the baked-in drop shadow per the marketing design rules), 430–700 KB each, under the 1 MB check:seo limit. Alt text and width/height attributes are updated to match.

The 2026-02-24 workflows blog post keeps its original image (dated record).

Blocked on asset upload

The new URLs point at assets.rivet.dev/website/marketing/screenshots/ and do not exist yet, so CI's check:seo (CHECK_REMOTE_ASSETS=1) will fail until they are uploaded. The PNGs were produced in an environment without R2 credentials; they're attached to the Amp thread that opened this PR. Upload with:

for f in rivet-actors-inspector-state rivet-dynamic-apps-release rivet-workflows-inspector; do
  AWS_ACCESS_KEY_ID='op://Engineering/rivet-assets R2 Upload/username' \
  AWS_SECRET_ACCESS_KEY='op://Engineering/rivet-assets R2 Upload/password' \
  op run -- aws s3 cp "$f.png" "s3://rivet-assets/website/marketing/screenshots/$f.png" \
    --content-type image/png \
    --endpoint-url https://2a94c6a0ced8d35ea63cddc86c2681e7.r2.cloudflarestorage.com
done

Dark-theme variants (*-dark.png), a SQLite events table capture (rivet-actors-sqlite-events.png, agent transcript rows) and an agentOS Console capture (rivet-agentos-console.png) were also produced but are not referenced by this PR; /agentos has no screenshot slot today.

Verification

• pnpm build (pnpm 10.13.1, Node 26) — 448 pages built.
• pnpm check:seo without remote fetch — passed (652 pages); the five pages above reference the new URLs, no other page references the old marketing screenshot.

[railway-app]

🚅 Deployed to the pr-1b8f48-53 environment in rivet-website

Service	Status	Web	Updated
website	✅ Success (View Logs)	Web	Sep 4, 2026 at 5:32 am UTC