android: replace prefab cache-busting hack with deterministic task wiring

[mrousavy]

Motivation

• The old fix-prefab.gradle globally disabled up-to-date checks and mutated generated .cxx/**/prefab_config.json timestamps, causing broad Gradle cache invalidation and repeated native reconfiguration/builds.
• The intent was to ensure prefab packaging runs when the native .so exists for consuming modules; this should be modeled in the Gradle task graph rather than by mutating generated files.

Description

• Removed the unconditional task.outputs.upToDateWhen { false } override from prefab*ConfigurePackage tasks to avoid forcing non-incremental behavior.
• Removed logic that touched .cxx/.../prefab_config.json timestamps that caused blanket cache invalidation.
• Added deterministic wiring so each consumer module's externalNativeBuild<Variant> task depends on this library's prefab<Variant>ConfigurePackage task and declares the prefab task outputs as explicit inputs with PathSensitivity.RELATIVE.
• Applied these changes to packages/react-native-nitro-modules/android/fix-prefab.gradle, packages/template/android/fix-prefab.gradle, and packages/react-native-nitro-test-external/android/fix-prefab.gradle.

Testing

• Verified the diff with git diff and inspected the patched files with nl to confirm changes applied; these commands succeeded.
• Staged and committed the changes with git add and git commit; the commit succeeded with message android: replace prefab cache-busting hack with task input wiring.
• Created the PR metadata via the repo helper (make_pr) to record the change; that operation completed successfully.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
nitro-docs	Ready	Preview, Comment	May 20, 2026 10:57am