Robert Winch 1b3cf72fc9
Add Nullaway Checkstyle
- Require package-info.java with @NullMarked in every package
- Suppress package checks for tests and modules that haven't been worked on
- Prevent non org.jspecify Nullability imports on enabled modules
- Validate Nullable is before modifiers

Closes gh-18564
2026-01-23 10:42:53 -06:00
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2026-01-23 10:42:53 -06:00