[xiaolai]

Summary

• Bumps the version to 0.9.120 in the five version files and syncs Cargo.lock.
• The release notes say plainly that this is a maintenance release with no change in behaviour: the only commit since 0.9.119 is chore: make clippy and the lib tests pass on the declared minimum Rust #1679 (lint and test fixes for the minimum supported Rust).

Validation

• pnpm check:all passed on main before any version file was touched (exit 0, 49720 app tests passed), on the updated local toolchain (rustc 1.99.1)
• node scripts/extract-changelog-section.mjs 0.9.120 --plain reads the new section
• The version matches in all five files; Cargo.lock changes one line

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