[rustyconover]

Moves the example worker's embedded engine (ExpressionFilterEvaluator, which evaluates pushed expression filters) from farm.query.haybarn:haybarn_jdbc:1.5.4-rc1 to 2.0.0-rc8 (Haybarn 2.0 / DuckDB 2.0 engine). That is the only JDBC reference in the repo; the published vgi core stays engine-free. The CLAUDE.md note is updated to match.

rc8 note: the Haybarn engine is at rc9, but haybarn_jdbc has not been re-released at rc9. 2.0.0-rc8 is the latest on Maven Central.

Adaptations: none needed. The 2.0 client keeps the farm.query.haybarn package, the jdbc:haybarn: URL and DuckDBConnection.registerArrowStream. INSTALL spatial FROM core resolves for v2.0.0. The rc8 jar ships linux amd64/arm64, macOS arm64 and windows amd64 natives. Platform change: 1.5.4-rc1 shipped osx_universal, so Intel macOS can no longer run the example worker's expression-filter evaluator on rc8. The published vgi core is unaffected.

Tested on EC2 Linux arm64, Temurin JDK 25.0.5:

• ./gradlew test :vgi:javadoc :vgi-example-worker:installDist: 805 tests, 0 failures, 14 skipped. That matches the 1.5.4-rc1 baseline exactly. The installed worker bundles haybarn_jdbc-2.0.0-rc8.jar.
• ci/run-integration.sh (launch lane), using a native runner built on the host from CI's pinned VGI_REF (7b1e1fb, Clang): 334 cases and 12521 assertions executed, 33 skipped. That is identical to main's launch lane. expression_filter.test passes; the 1 require spatial skip is a runner-side skip, the same as on main.
• PR CI (amd64): Unit tests, Hosted protocols, Build worker and integration launch/shm/http all pass, with counts identical to main (334/333/330 cases).
• smoke test of the rc8 jar: version() = v2.0.0 2dc3a8066b, spatial install/load, && and list_contains.

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