fix(ci): handle contract check on main pushes

[frahlg]

What changed

Skip the PR body lookup when the contract job runs for a main push. Pull-request runs still read an optional Contract-pair, while push runs use the documented srcfl/ftw@master default.

Root cause

The workflow runs for both pull requests and pushes, but unconditionally evaluated gh pr view "${{ github.event.pull_request.number }}". A push has no pull-request number, so this became gh pr view "" and failed before either drift comparison ran.

Impact

Post-merge CI can now execute the actual registry and token comparisons instead of failing during event setup.

Validation

• simulated a push with an empty PR number and proved gh is not called and master is selected
• simulated a PR body with Contract-pair: srcfl/ftw@paired-branch and proved that branch is selected
• git diff --check

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	ftw-webapp	fd66a77	Commit Preview URL Branch Preview URL	Aug 12 2026, 12:12 PM