Revert tool-choice forcing — the Codex regression was strict:null

The GPT-account (Codex) path supports tool calls and worked before; my
forced tool_choice broke it and was the wrong fix. The real regression was
strict:null in the rebuild's tool definitions, which made the endpoint drop
the tool list so the model had nothing to call — a "Done" run that hired no
one. Forcing then turned that silent failure into a red one.

Restore the original "auto" loop (no forced tool_choice, no finish tool) and
keep only the one-line strict:null omission. Codex now receives valid tools
on the working "auto" choice, as in the version that worked.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

AgentCompany-New/src/main/services/provider-response-runner.ts

@@ -12,7 +12,7 @@ import type { ProviderRateLimitRegistry } from "./provider-rate-limit-registry";
 import type { ProviderRequestStore } from "./provider-request-store";
 import type { ProviderResponseObserver } from "./provider-response-observer";
 import { hashPrompt, readProviderResponseId, requireStreamText } from "./provider-response-utils";
-import { type AgentTurnMessage, type AgentTurnResult, type ToolChoice, type ToolDefinition, type ToolTurnFn } from "./provider-tool-turn";
+import { type AgentTurnMessage, type AgentTurnResult, type ToolDefinition, type ToolTurnFn } from "./provider-tool-turn";
 import { selectToolTurn, supportsToolTurn } from "./provider-tool-turns/router";
 import { resolveTurnCredential } from "./provider-tool-turns/credential-resolver";
 import {
@@ -103,7 +103,6 @@ export class ProviderResponseRunner {
     instructions: string | null;
     messages: AgentTurnMessage[];
     tools: ToolDefinition[];
-    toolChoice?: ToolChoice;
   }): Promise<AgentTurnResult & { requestId: string }> {
     const provider = loadConfiguredProvider(this.deps.db, input.orgId, input.providerId);
     const workspaceId = this.normalizeWorkspaceId(input.orgId, input.workspaceId ?? null);
@@ -129,7 +128,7 @@ export class ProviderResponseRunner {
     });
     const startedAt = Date.now();
     try {
-      const result = await turn({ credential, model, instructions: input.instructions, messages: input.messages, tools: input.tools, toolChoice: input.toolChoice });
+      const result = await turn({ credential, model, instructions: input.instructions, messages: input.messages, tools: input.tools });
       this.deps.requestStore.markSucceeded({
         orgId: input.orgId,
         requestId,