feat(adapter): claude local chrome flag and max-turns session handling

Add --chrome flag support for Claude adapter. Detect max-turns
exhaustion (via subtype, stop_reason, or result text) and clear
the session to prevent stale session re-use. Add unit tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/__tests__/claude-local-adapter.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+import { isClaudeMaxTurnsResult } from "@paperclip/adapter-claude-local/server";
+
+describe("claude_local max-turn detection", () => {
+  it("detects max-turn exhaustion by subtype", () => {
+    expect(
+      isClaudeMaxTurnsResult({
+        subtype: "error_max_turns",
+        result: "Reached max turns",
+      }),
+    ).toBe(true);
+  });
+
+  it("detects max-turn exhaustion by stop_reason", () => {
+    expect(
+      isClaudeMaxTurnsResult({
+        stop_reason: "max_turns",
+      }),
+    ).toBe(true);
+  });
+
+  it("returns false for non-max-turn results", () => {
+    expect(
+      isClaudeMaxTurnsResult({
+        subtype: "success",
+        stop_reason: "end_turn",
+      }),
+    ).toBe(false);
+  });
+});