ben-manes / caffeine / #5674

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Split ErrorProne off the compile critical path

ErrorProne and NullAway are compiler plugins fused into every
JavaCompile, so build.yml's `assemble` ran them across the whole tree
before any test could start (~7-10 min on the critical path). The test
shards reuse those compiled classes from the remote cache, so the
analysis gated the entire pipeline.

Add a `-Plint` toggle (default on; gates ErrorProne, NullAway, and
-Werror) and default it off in the run-gradle action, so the CI compile
and shards run a bare javac and share one cache entry. ErrorProne now
runs in a dedicated parallel `errorprone` job in analysis.yml on JDK 11
and 26, alongside PMD/SpotBugs/ECJ. Local builds are unchanged (lint
defaults on).

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