Tease 0.5.1 — documentation refresh

Tease 0.5.1 is a documentation patch. It shortens the crates.io README, adds version, documentation, CI, and license badges, and moves detailed feature behavior and limits into a packaged guide. The lockfile also replaces a yanked transitive dependency entry.

There are no Tease API or runtime behavior changes.

The six-job CI matrix covers builds, tests, linting, documentation, and packaged consumers on macOS, Windows, and Linux. Manual native Windows and Linux GUI smoke checks remain tracked in #7.