Remove old Claude Code workflow

[ask-bonk]

Deleted .github/workflows/claude.yml — the old Claude Code workflow that was triggered by @claude mentions in issues and PR comments. This workflow has been superseded by the current setup.

Closes #906

github run

[changeset-bot]

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Latest commit: e91e582

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[pkg-pr-new]

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npm i https://pkg.pr.new/cloudflare/agents@907

commit: e91e582