feat(web): show required pull request checks

[incognitojam]

Note

Shows GitHub repository requirements directly in the Checks tab and promotes Auto-merge when a pull request is blocked but otherwise mergeable.

What changed

• Added GitHub repository-policy-aware merge readiness to pull request details.
• Marked reported required checks and synthesized waiting rows for required checks that have not reported yet.
• Read effective repository and organization rulesets alongside classic branch protection, with graceful GitHub Enterprise degradation.
• Replaced the primary Merge action with Auto-merge when GitHub says the pull request is blocked and the viewer may enable auto-merge.
• Kept unknown merge states and behind-base branches on their existing merge/update flows.

Why

A green or red job list does not explain whether GitHub will actually allow a merge. Required checks and GitHub’s merge-readiness verdict make the Checks tab answer that question directly, while Auto-merge becomes the obvious action when requirements are still outstanding.

UI changes

Captured against this pull request while its required checks were running.

Before: reported jobs only	After: repository requirements

Verification

• vp test run apps/server/src/pullRequest/GitHubPullRequestCli.test.ts apps/server/src/pullRequest/GitHubPullRequestProvider.test.ts apps/server/src/pullRequest/PullRequestService.test.ts apps/server/src/pullRequest/gitHubPullRequestJson.test.ts apps/server/src/pullRequest/pullRequestChecks.test.ts apps/web/src/components/pullRequest/PullRequestChecksTab.test.tsx apps/web/src/components/pullRequest/pullRequestChecks.test.tsx apps/web/src/components/pullRequest/pullRequestDetail.logic.test.ts
• vp run t3#typecheck
• vp run @t3tools/web#typecheck
• vp run @t3tools/contracts#typecheck
• Targeted formatting and lint checks

Checklist

• This PR is focused on GitHub merge requirements and the action they imply
• I explained what changed and why
• I included before/after screenshots for the UI change
• No video is needed because this change adds no motion or timing behavior

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Written by an agent (T3 Code, gpt-5.6-sol).