BARE + vbare protocol crates

Conventions for RivetKit protocol crates that use BARE schemas with versioned codecs via vbare.

Workspace integration

New crates under rivetkit-rust/packages/ that should inherit repo-wide workspace deps must set [package] workspace = "../../../" and be added to the root /Cargo.toml workspace members.

RivetKit protocol crates with BARE uint fields use vbare_compiler::Config::with_hash_map() because serde_bare::Uint does not implement Hash.
vbare schemas must define structs before unions reference them. Move legacy TS schemas' out-of-order definitions before adding them to Rust protocol crates.
vbare types introduced in a later protocol version still need identity converters for skipped earlier versions so serialize_with_embedded_version(latest) sees the right latest version.

Protocol crate build.rs TS codec generation follows engine/packages/runner-protocol/build.rs: run @bare-ts/tools, post-process to @rivetkit/bare-ts, and write generated imports under rivetkit-typescript/packages/rivetkit/src/common/bare/generated/<protocol>/.

RivetKit core actor/inspector BARE protocol code uses generated protocol crates plus vbare::OwnedVersionedData, not hand-rolled BARE cursors or writers.
The high-level rivetkit crate stays a thin typed wrapper over rivetkit-core and re-exports shared transport/config types instead of redefining them.
When rivetkit needs ergonomic helpers on a rivetkit-core type it re-exports, prefer an extension trait plus prelude re-export instead of wrapping and replacing the core type.