Integrate live URL prepaint APK path

[isomorphisms]

Summary

• join the prepaint-network and native Android viewer lines into one first live vertical slice
• pass one exact bounded HTTP(S) URL to a fixed Termux command, fetch through ICU, and render fetched HTML through the Idriç information extractor
• accept only a clean, complete, untruncated, URL-matching prepaint artifact before replacing the visible Android page
• keep the APK free of INTERNET permission and WebView, with explicit Termux/ICU/Idriç setup requirements

The integration commit retains prepaint-network-predecision and android-prepaint-viewer as explicit parents.

Current Android target

This PR is retained as a tested transitional vertical slice, not the selected package/runtime architecture. Do not satisfy its Termux-side renderer requirement by pulling in the experimental ARM/Thumb backend or the ARMv7 Termux compiler bundle.

For current Android application work, direct DEX is the selected class/runtime path and JNI is the narrow native/platform boundary. The physical phone remains an acceptance target for Edriç and Grease, but unfinished native compiler backends are not dependencies of IB package builds. A future live-navigation integration should preserve this PR's URL/result validation and prepaint-state semantics while replacing the transitional renderer execution path with the DEX/JNI lane.

Validation

• sh bin/ci_browser_foundation.grease exercise-prepaint-network
• IDRIC_PREFIX=/tmp/idric-exact sh bin/ci_browser_foundation.grease exercise-information with the pinned Idriç compiler
• pure-Java compilation and contract harness for URL recognition, artifact parsing, truncation, failure, and stale-URL rejection
• git diff --check

GitHub Actions remains the authoritative Android SDK/Gradle APK build for this transitional slice.