Add get_model and send_telemetry to Rust-only API list

Bot review on PR #1164 (comment 3164786116) caught two more accidental
omissions in the README's 'Rust-only API' section. Both methods are
real and exposed; just missing from this inventory:

- Session::get_model — wraps session.model.getCurrent. Folded into the
  existing 'First-class Session convenience methods' bullet.
- Client::send_telemetry / Session::send_telemetry — wrap sendTelemetry
  / session.sendTelemetry. Added a new dedicated bullet because no
  other SDK exposes these RPC endpoints in their public API at all
  (not even via typed namespaces), so it's a higher-divergence item
  worth its own line.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: tclem

rust/README.md

@@ -685,10 +685,14 @@ none of them are scheduled for removal.
   The underlying `account.getQuota` JSON-RPC endpoint is exposed only by
   the Rust SDK in this release.
 - **First-class `Session` convenience methods** — `set_mode` / `get_mode`,
-  `set_name` / `get_name`, `read_plan` / `update_plan` / `delete_plan`,
-  `start_fleet`, `list_workspace_files` / `read_workspace_file` /
-  `create_workspace_file`. The other SDKs require the consumer to drive
-  the typed JSON-RPC namespace directly for these.
+  `set_name` / `get_name`, `get_model`, `read_plan` / `update_plan` /
+  `delete_plan`, `start_fleet`, `list_workspace_files` /
+  `read_workspace_file` / `create_workspace_file`. The other SDKs require
+  the consumer to drive the typed JSON-RPC namespace directly for these.
+- **`Client::send_telemetry` / `Session::send_telemetry`** — top-level
+  and session-scoped telemetry emission via `sendTelemetry` /
+  `session.sendTelemetry`. Other SDKs do not currently expose these RPC
+  endpoints in their public APIs (not even via the typed namespace).
 - **Typed newtypes** — `SessionId` and `RequestId` are `#[serde(transparent)]`
   newtypes around `String`, so the type system distinguishes a session
   identifier from an arbitrary `String` at compile time. Node/Python/Go