docs: present CipherBid engineering and verified mainnet evidence

[SourceSenseiTheRealOne]

Summary

• Replace the long submission README with a concise engineering presentation and real settled-mainnet screenshot.
• Add engineering/local-development notes, retain explicit mainnet addresses and link the immutable transaction record.
• Reconcile the organizer's revision-pinned finished/demo/video/mainnet readback without implying an award.
• Make the homepage's Open live auction link open the verified mainnet auction, with a RED → GREEN regression.
• Correct stale hosting and WSL documentation. Keep repository name, Pages URL, contracts, deployment manifest, recovery/wallet implementation and dependencies unchanged.

Verification

• 195 Vitest tests, 6 Chromium E2E tests; format, lint, strict types, workflow policies, regular and Pages production builds passed at the relocated canonical checkout.
• Staged Gitleaks scan clean; documentation relative links checked.
• Protected contract/config/manifest/dependency/evidence files unchanged.
• Public homepage and settled mainnet auction read in clean desktop/mobile browsers; no wallet connection or blockchain write.
• Cairo gates will run in the existing pinned GitHub CI; local WSL Cairo tools are not installed on PATH.

Known separate maintenance

The unchanged production lockfile reports 2 critical Next.js and 1 high sharp advisory. These concern server-side Windows hosting and AVIF/image decoding; the existing public deployment remains a static Pages export, with no Next server or optimizer endpoint. Local-development docs disclose the findings, patched minimum versions and loopback-only guidance. This presentation PR does not claim a clean dependency audit or silently upgrade packages.

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