v1.9.0-rc.26

Comprehensive rc.25 test_app regression fixes via alef 0.23.34: php enum reserved-word escape, java javadoc */ escape, swift RustString import, zig build.zig.zon hash pre-fetch, dart Abi.current() loader, java pom FFI fallback, php install.sh php.ini auto-enable. Also adds 3 tag-query fixtures. See CHANGELOG.md.