RealAnalyst 0.2.5

• Refined RA:metadata into a lighter but still complete execution entrypoint.\n- Kept YAML contracts, maintenance rules, and Tableau/DuckDB adapter details in focused references.\n- Improved metadata registry sync by separating source measures from semantic metrics and deduplicating available metric names.\n\nValidation: plugin JSON, metadata validate, git diff --check, py_compile, sync-registry dry run, GitHub Actions success for main and v0.2.5.