Fix the OpenBell social-card cache boundary

[dolepee]

Why

X reused the retired openbell-og.png cache entry even after the live image changed, showing an obsolete no-value testnet card beside accurate mainnet copy.

Change

• publish the verified mainnet rejection card under a new immutable URL
• point every Open Graph and Twitter image tag to that URL
• update metadata parity tests

Verification

• FOUNDRY_OFFLINE=true npm run check
• 111 Vitest tests, 41 Foundry tests, 39 web tests
• evidence parity, public-boundary scan, and Sites build all pass
• new asset is byte-identical to the reviewed verified card

[dolepee]

@codex review exact final head 28ed391

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 28ed391dff

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[dolepee]

@codex review exact final head a8ed0e9

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: a8ed0e9e1f

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".