chore: release v0.11.8

Author: acp-release-bot[bot]

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## [0.12.0](https://github.com/agentclientprotocol/agent-client-protocol/compare/v0.11.7...v0.12.0) - 2026-04-17
+
+### Added
+
+- *(rust-only)* Remove unused RPC message schema types (schema.json unchanged) ([#1009](https://github.com/agentclientprotocol/agent-client-protocol/pull/1009))
+- *(rust-only)* better tolerate malformed optional fields in deserialization ([#1006](https://github.com/agentclientprotocol/agent-client-protocol/pull/1006))
+
+### Fixed
+
+- *(rpc)* preserve '_' prefix for extension methods and reject empty ext ([#883](https://github.com/agentclientprotocol/agent-client-protocol/pull/883))
+
 ## [0.11.7](https://github.com/agentclientprotocol/agent-client-protocol/compare/v0.11.6...v0.11.7) - 2026-04-15
 
 ### Added

Cargo.lock

@@ -1,7 +1,7 @@
 [package]
 name = "agent-client-protocol-schema"
 authors = ["Zed <hi@zed.dev>"]
-version = "0.11.7"
+version = "0.12.0"
 edition = "2024"
 license = "Apache-2.0"
 description = "A protocol for standardizing communication between code editors and AI coding agents"