T07: Cargo workspace scaffold — cb-kernel/cb-events/cb-game-runtime/games-ground/cb-sim, HashMap deny-lint, scenario format + runner stub, Criterion skeleton, Makefile, CI

games/ground/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "games-ground"
+edition.workspace = true
+version.workspace = true
+license-file.workspace = true
+
+[dependencies]
+cb-kernel.workspace = true
+cb-events.workspace = true
+cb-game-runtime.workspace = true
+serde.workspace = true
+
+[dev-dependencies]
+criterion.workspace = true
+
+[[bench]]
+name = "synthetic"
+harness = false
+
+[lints]
+workspace = true