Use changed-pages.json for preview comment links

[reakaleek]

Why

• Codex and docs preview comments invent URLs from changed file paths. Those links miss navigation rules, path prefixes, and snippet include mapping.
• The docs-builder git-diff exporter writes accurate page URLs to changed-pages.json.

What

• Upload and download the changed-pages artifact in Codex preview and docs deploy workflows.
• Replace path-based comment link generation with JSON from the builder artifact.
• Fetch the PR base ref for in-container git diff when file lists are not set.

Notes

• Requires a docs-builder release that includes the git-diff exporter before preview comments show page links.
• When the artifact is missing, comments link to the full preview only.

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