The APKPure direct endpoint (d.apkpure.com/b/APK/<pkg>) now returns an HTTP
403 Cloudflare bot challenge for every package, so downloads always failed —
which also blocked the entire reverse-engineering chain downstream (it never
ran because Phase 1 produced no APK).
- download-apk.sh: fetch the APKCombo download page with a browser UA, extract
the embedded /r2?u=<signed-url> link, and download that. No JS needed; the
URL slug is ignored so a literal 'app' works for any package. Verified
end-to-end against com.wonder (Elevate) -> 126MB xapk -> RE fingerprint.
- test-download-apk.sh: model the two-step flow and the page-without-link case.
- resolve-re-scripts.sh: warn (stderr) when bash < 4, since the upstream RE
scripts use ${VAR,,} and fail with 'bad substitution' on macOS bash 3.2.
- SKILL.md / README.md / CLAUDE.md: document the APKCombo source and bash 4+ req.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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