fix(opencode): use ACP-reported reasoning effort options (#853)

* fix(opencode): use ACP-reported reasoning effort options

Expose thought_level options from OpenCode ACP to the web UI via RPC/API
instead of hardcoded presets, and validate effort values before setConfigOption.

Fixes #852

Co-authored-by: Cursor <cursoragent@cursor.com>

* fix(opencode): sync hub effort after coerced setConfigOption

When resolveThoughtLevelEffort falls back to a different supported value,
roll back session state after a successful ACP update so keepalive and the
web UI do not keep advertising the rejected effort.

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

hub/src/sync/syncEngine.ts

@@ -29,6 +29,7 @@ import {
     type RpcListCodexModelsResponse,
     type RpcListCursorModelsResponse,
     type RpcListOpencodeModelsResponse,
+    type RpcListOpencodeReasoningEffortOptionsResponse,
     type RpcCursorModel,
     type RpcOpencodeModel,
     type RpcPathExistsResponse,
@@ -49,6 +50,7 @@ export type {
     RpcListCodexModelsResponse,
     RpcListCursorModelsResponse,
     RpcListOpencodeModelsResponse,
+    RpcListOpencodeReasoningEffortOptionsResponse,
     RpcCursorModel,
     RpcOpencodeModel,
     RpcPathExistsResponse,
@@ -1088,4 +1090,8 @@ export class SyncEngine {
     async listOpencodeModelsForCwd(machineId: string, cwd: string): Promise<RpcListOpencodeModelsResponse> {
         return await this.rpcGateway.listOpencodeModelsForCwd(machineId, cwd)
     }
+
+    async listOpencodeReasoningEffortOptionsForSession(sessionId: string): Promise<RpcListOpencodeReasoningEffortOptionsResponse> {
+        return await this.rpcGateway.listOpencodeReasoningEffortOptionsForSession(sessionId)
+    }
 }