[Shaan-Shoukath]

Summary

The 404 page's pet is now Patch, the painted wolf from the Space Works design system, instead of the hand-drawn golden retriever. It behaves the same:

• runs toward the pointer, or toward a tap;

• hops;

• leaves fading paw prints;

• wanders, then naps with floating z's;

• when patted, closes its eyes happily and sends up hearts.

• Artwork: the design system's own walk cycle, mascot/original/walk/ and the newly approved walk-left/ (SpaceWorks-HQ/SpaceWorks-Design#9). It is packed as one 8-frame sprite sheet per direction in public/brand/patch/, about 59 KB each.

• Brand rules: Patch is never flipped or redrawn; heading left switches to the left-facing sheet. Running plays the cycle at double speed. Sleeping and patting use frame 6, where Patch's eyes are closed as drawn on the sheet. No shadow is added.

• Dropped: the retriever's eyes followed the pointer; raster artwork can't do that.

• Unchanged: still decorative (aria-hidden, click-through) and still for reduced-motion users.

• README: the 404 screenshot is removed, and its file docs/readme/screens/not-found.webp is deleted.

Test plan

• eslint, tsc --noEmit
• Rendered every state (sit, walk, run left, sleep, patted) from the real stylesheet block and sprites in Edge: the walk frames advance, heading left uses the left sheet, and sleep and patted show the closed-eyes frame.
• Full app check of the 404 page. It needs a running app, which this checkout couldn't start without a .env.

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