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* [2.x] feat: Add cacheVersion setting for global cache invalidation **Problem** There was no escape hatch to invalidate all task caches when needed. **Solution** Add `Global / cacheVersion` setting that incorporates into the cache key hash. Changing it invalidates all caches. Defaults to reading system property `sbt.cacheversion`, or else 0L. When 0L, the hash is identical to the previous behavior (backward compatible). Fixes #8992 * [2.x] refactor: Simplify BuildWideCacheConfiguration and add cacheVersion test - Replace auxiliary constructors with default parameter values - Add unit test verifying cacheVersion invalidates the cache * [2.x] fix: Restore auxiliary constructors for binary compatibility * [2.x] test: Improve cacheVersion scripted test and add release note - Scripted test now verifies cache invalidation via a counter that increments only when the task body actually executes - Add release note documenting the cacheVersion setting