[fix]: align preview workflows to target 'site' branch

[banana-three-join]

Reason

layer5io/recognition settings are configured to serve content from the site branch but the deployment and pruning steps in the Website Preview Post-Build action were directed to gh-pages so a substitution to the target branch is needed.

Changes

• Preview Deployment: Configured rossjrw/pr-preview-action to deploy PR previews explicitly to the site branch.
• Preview Retention: Updated the prune job to checkout, fetch, clean up, and push changes directly against site instead of gh-pages.

Signed commits

• Yes, I signed my commits.

Summary by CodeRabbit

• Chores
  • Updated preview deployments to use the site branch.
  • Adjusted preview retention cleanup to target the new branch.
  • Preserved retry handling and best-effort cleanup behavior.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: eddacba0-359d-4759-9241-0e301c7609a0

📥 Commits

Reviewing files that changed from the base of the PR and between d71a68d and 44fd488.

📒 Files selected for processing (1)

• .github/workflows/deploy-preview-site.yml

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📝 Walkthrough

Walkthrough

The preview deployment workflow now uses the site branch for deployment and retention pruning. It updates checkout paths, fetch and push commands, and concurrency warnings. Retry and best-effort failure behavior remains unchanged.

Changes

Site branch deployment and retention pruning

Layer / File(s)	Summary
Preview deployment and retention pruning .github/workflows/deploy-preview-site.yml	Preview deployment and retention maintenance now target site. Maintenance uses the site-maintenance directory and updated fetch, push, and concurrency messages. Retry and non-failing fallback behavior remain unchanged.

Estimated code review effort: 2 (Simple) | ~10 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

Preview removed because the pull request was closed.