feat(acp): map sent requests to application types

[benbrandt]

No description provided.

[Copilot]

Pull request overview

This PR extends the ACP JSON-RPC layer to support mapping a SentRequest’s successful JSON-RPC response into arbitrary application types (including types that do not implement JsonRpcResponse), using one-shot (FnOnce) mappers. This fits into the core protocol SDK by making response consumption more ergonomic and enabling richer application-layer typing without changing the wire protocol.

Changes:

• Generalize SentRequest consumption APIs to work with mapped (non-JsonRpcResponse) result types, and allow FnOnce mapping/decoding closures.
• Update response-consumption plumbing so mapped values can be consumed without requiring Send in cases where it’s not necessary.
• Add an advanced JSON-RPC test covering mapping into an application type and consuming a non-Send mapped value on a LocalSet.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/agent-client-protocol/tests/jsonrpc_advanced.rs	Adds a regression test validating SentRequest::map to application types and block_task() consumption of a mapped non-Send value.
src/agent-client-protocol/src/jsonrpc.rs	Updates SentRequest internals and APIs to support FnOnce mapping and mapped result consumption without requiring JsonRpcResponse.
src/agent-client-protocol/CHANGELOG.md	Documents the new SentRequest mapping/consumption capability in the Unreleased section.