IC Wire Endpoint

Typed query and update entrypoints backed by IC Platform 0.16. Core codec, Limits/Error and schema identities remain owned by ic-wire independently of runtime integration releases. Platform owns execution and the singleton guard.

Replace Wire's removed endpoint feature with an ic-wire-endpoint dependency. Move attributes/helpers from ic_wire::endpoint to ic_wire_endpoint; retain codec and schema imports from ic_wire. Enable typescript here for native Contract schema projection. Frame bytes, bounds, acceptance and rollback rules are unchanged. See the repository endpoint guide for handler examples.

Endpoint 0.3 adopts Platform 0.16. Align all runtime suppliers, including timers, before adopting it; Endpoint 0.2.1 retains Platform 0.15. Canonical Principal/Account remain Types 0.15.1, so the Core 0.13 codec/schema identity and retained Wire bytes do not change.