v5.3.0

What's Changed

• docs: align bilingual documentation and improve project entry points by @Iviesever in #126
• test: add reproducible build-system comparison harness by @Iviesever in #127
• perf: isolate benchmarks and optimize invocation warm path by @Iviesever in #128
• perf: reduce cold-build toolchain discovery overhead by @Iviesever in #131
• perf: skip stale PCH consumer validation by @Iviesever in #132

Full Changelog: v5.2.0...v5.3.0