v0.1.2

release: publish valid zed-lock 0.1.2 package

* release: bump zed package to 0.1.2

* release: bump crate to 0.1.2

* release: refresh lockfile for 0.1.2

* docs: cut 0.1.2 release notes

* ci: publish immutable zed-lock 0.1.2 artifact

* fix(ci): make release version check portable

* fix(package): validate Cargo and Zed version parity

* fix(ci): derive review artifact version from Cargo metadata

* fix(release): certify package on declared Rust toolchain