chore(ci): replace Ruby Pages build with Bun/Node publisher

[hyperpolymath]

Replace the legacy Ruby/Jekyll Pages workflow with the estate-standard deterministic publisher. This removes the Jekyll workflow and Ruby lock pins, adds a Bun-first / Node 18 fallback build, preserves the repository's published data paths, and adds the Ruby tooling Dependabot ignores.

This is the mechanical Pages-only migration from the estate Ruby recon; no Ruby application behaviour is being removed.

[coderabbitai]

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Run ID: b311c363-7074-4cd8-9782-fd1079b693c6

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Reviewing files that changed from the base of the PR and between f92bc65 and 9d1edb1.

⛔ Files ignored due to path filters (1)

• .github/workflows/actions.lock is excluded by !**/*.lock

📒 Files selected for processing (6)

• .github/dependabot.yml
• .github/workflows/jekyll-gh-pages.yml
• .github/workflows/pages.yml
• .gitignore
• scripts/build-site.mjs
• site.json

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