fix: dedupe GitHub App reports without push metadata

[blalor]

What

Build the label-filtered issue index even when repos.get() does not report push access. Push access now controls only whether Frog expects labels to stick on newly created issues.

The unlabelled fallback also scans issues newest-first, so its 5,000-item ceiling includes recent reports.

Why

GitHub App installation tokens can create labelled issues while the repository response omits permissions.push. Frog 1.1.0 treats those repositories as unlabelled and scans their oldest 5,000 issues. In larger repositories, a repeated publish cannot find the recent issue and creates a duplicate.

Fixes #83.

Testing

• Added coverage for a labelled issue when push access is not reported.
• Updated the pagination regression to verify that a recent issue beyond the oldest 5,000 is found.
• pnpm test: 45 files, 729 tests passed.
• pnpm check:types passed.

[vercel]

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