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Fix Gradle build cache skipping JaCoCo offline instrumentation (#471)

The doLast block that instruments bytecode for Maestro coverage was
silently skipped when the Java compile task was restored from Gradle's
build cache (org.gradle.caching=true). A cached output from a build
without -PmaestroCoverage has no JaCoCo probes, so the coverage
broadcast receiver could not find the Offline class at runtime,
producing the NO_CLASS error.

Add inputs.property('jacocoOfflineInstrumentation', true) to the
compile task when -PmaestroCoverage is set. This changes the cache key
so Gradle treats instrumented and non-instrumented builds as distinct,
ensuring the doLast instrumentation block always runs when needed.

Also improve error reporting: the broadcast receiver now distinguishes
between ClassNotFoundException (class not in DEX) and
NoClassDefFoundError (initialization failure) with actionable messages,
and the collection script logs the receiver's detailed diagnostic output
on NO_CLASS.

https://claude.ai/code/session_019CDpRHLozMJushearVsepd

Co-authored-by: Claude <noreply@anthropic.com>

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