chore(main): release 0.85.0 (#1209)

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


##
[0.85.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.84.0...v0.85.0)
(2026-10-01)


### Features

* **deps:** Bump @anthropic-ai/claude-agent-sdk to 0.3.286
([#1211](https://github.com/agentclientprotocol/claude-agent-acp/issues/1211))
([f53b0d7](f53b0d7f40))


### Bug Fixes

* Adapt to SDK 0.3.284 replay and ultracode changes
([#1208](https://github.com/agentclientprotocol/claude-agent-acp/issues/1208))
([4af8079](4af807968c))
* send the legacy custom answer key to AIR
([#1210](https://github.com/agentclientprotocol/claude-agent-acp/issues/1210))
([af0b43d](af0b43de94))

---
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>

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "0.84.0"
+  ".": "0.85.0"
 }