fix: android consumer-rules

[ovitrif]

Fixes #105

Follow-up to #106.

The Android AAR ships consumer keep rules for UniFFI/JNA so a minified app can resolve JNI names and lay out JNA structs.

Library publish packages proguard.txt in the AAR. Minified-app R8 belongs in the consuming app.

Description

• Keeps com.sun.jna.* so libjnidispatch can resolve JNI names on Native, Structure, and CallbackReference.
• Keeps classes that extend com.sun.jna.*, including com.sun.jna.ptr ByReference types used as UniFFI callback out-params.
• Keeps com.sun.jna.Structure$FieldOrder and annotated org.lightningdevkit.ldknode struct classes, fields, and constructors.
• Fails bundleReleaseAar when the AAR is missing a non-empty proguard.txt.

Out of scope

• Running R8 in this repo.

Preview

N/A — Android consumer keep rules only.

QA Notes

• Release AAR contains a non-empty proguard.txt with those consumer keep rules.

Release

• v0.7.0-rc.65

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[ovitrif]

Merged without waiting on review.

This only ships Android consumer keep rules in the AAR (proguard.txt). Those rules are unused until a consuming app enables R8. Bitkit does not do that until synonymdev/bitkit-android#1184 lands, so merging this now does not change runtime behavior for current consumers.

The Android PR is the actual enablement and the place to review the live impact.

These changes were a port of the synonymdev/bitkit-core#145 PR changes which were reviewed and tested on android.