[NEW] Android CI smoke + 16KB alignment hard gate

[justinjoy]

Parent (umbrella)

#446

Category: CI
Depends on: #464
Blocking: Yes
Sizing: S

Deliverable: CI job pinning NDK r26d. Cross-compiles arm64-v8a. Runs readelf -l libwirelog.so | grep LOAD and asserts alignment >= 0x4000. HARD FAIL (Play Store rejection is binary once 16KB becomes mandatory).

Files: .github/workflows/android.yml, scripts/ci/check-android-alignment.sh

Tests: CI green at baseline; intentionally misaligned build triggers failure.