The owner approved removing the old code. Deletes the 0.x engine
(actions/, model/, tables/, the old processes and registry plugins) and
its tests, which 1.0 replaced, and drops the TEMPORARY compiler and
Checkstyle exclusions from pom.xml and the note in CLAUDE.md/AGENTS.md.
./mvnw clean verify: 144 tests, 0 failures, Checkstyle clean, JaCoCo
gate met.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>