feat(app-server): add review and model parity APIs

Finish the thread/resume compatibility shim and add native model/list and review/start handlers to the local app-server compatibility layer.

Author: cbusillo

code-rs/Cargo.lock

@@ -26,6 +26,7 @@ code-app-server-protocol = { workspace = true }
 code-protocol = { workspace = true }
 code-utils-absolute-path = { workspace = true }
 code-utils-json-to-toml = { workspace = true }
+chrono = { workspace = true }
 futures = { workspace = true }
 # We should only be using mcp-types for JSON-RPC types: it would be nice to
 # split this out into a separate crate at some point.