chore(main): release 0.89.0 (#1279)

🤖 I have created a release *beep* *boop*
---


##
[0.89.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.88.0...v0.89.0)
(2026-10-09)


### Features

* add the AIR sessionIndex extension for fast session lists
([#1268](https://github.com/agentclientprotocol/claude-agent-acp/issues/1268))
([03d84f6](03d84f6663))
* **deps:** Bump @agentclientprotocol/sdk to 1.8.0
([#1287](https://github.com/agentclientprotocol/claude-agent-acp/issues/1287))
([446a721](446a7217fa))
* Support custom instructions for agent sessions via meta
([#1177](https://github.com/agentclientprotocol/claude-agent-acp/issues/1177))
([908c994](908c994901))


### Bug Fixes

* recreate live sessions on logout when it clears a provider or gateway
override
([#1278](https://github.com/agentclientprotocol/claude-agent-acp/issues/1278))
([966be7a](966be7abe6))
* report a failed turn with the error stop reason on the experimental
ACP v2 surface
([#1288](https://github.com/agentclientprotocol/claude-agent-acp/issues/1288))
([060bdb2](060bdb212a))
* report an interrupted tool call as cancelled on the experimental ACP
v2 surface
([#1289](https://github.com/agentclientprotocol/claude-agent-acp/issues/1289))
([55c3106](55c3106c60))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: acp-release-bot[bot] <246668977+acp-release-bot[bot]@users.noreply.github.com>

package.json

@@ -3,7 +3,7 @@
   "publishConfig": {
     "access": "public"
   },
-  "version": "0.88.0",
+  "version": "0.89.0",
   "description": "An ACP-compatible coding agent powered by the Claude Agent SDK (TypeScript)",
   "main": "dist/lib.js",
   "types": "dist/lib.d.ts",