test: add sync check for hybrid-chunk-size default across bindings

Problem

The default value 50 for --hybrid-chunk-size is duplicated across four sources (HybridConfig.DEFAULT_CHUNK_SIZE, the CLI OptionDefinition, options.json, and generated Python/Node bindings). If the constant changes without npm run sync, wrappers and JVM silently disagree. ci-verify only checks flag presence/exemption, not default-value equality.

Suggested fix

Add a sync test asserting options.json default equals HybridConfig.DEFAULT_CHUNK_SIZE and the CLI OptionDefinition default.

Severity: P3 | Confidence: 75 | Reviewer(s): testing