Prepare v0.2.2 release

docs/releases/v0.2.2.md

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+# Omnigraph v0.2.2
+
+Omnigraph v0.2.2 is a packaging follow-up to v0.2.1. It keeps the CLI and server surface the same, but renames the published runtime crate from `omnigraph` to `omnigraph-engine` so the full crate set can be published cleanly to crates.io.
+
+## Highlights
+
+### Published runtime crate rename
+
+The runtime package is now published as:
+
+- `omnigraph-engine`
+
+The in-code Rust library name remains `omnigraph`, so internal imports and code paths stay stable. CLI users are unaffected.
+
+### Crates.io metadata cleanup
+
+All published crates now ship repository, homepage, and documentation metadata so the crates.io pages are complete and the release pipeline no longer emits missing-package-metadata warnings.
+
+## Included Changes
+
+- rename runtime package from `omnigraph` to `omnigraph-engine`
+- bump `omnigraph-engine`, `omnigraph-compiler`, `omnigraph-server`, and `omnigraph-cli` to `0.2.2`
+- update dependent manifests and CI package references to the new runtime package name
+
+## Upgrade Notes
+
+- Rust consumers should depend on `omnigraph-engine` on crates.io
+- Code that imports the library can continue using `omnigraph` as the crate name
+- The `omnigraph` CLI binary name is unchanged