Improve codex-local adapter: skill injection, stdin piping, and error parsing

Codex adapter now auto-injects Paperclip skills into ~/.codex/skills,
pipes prompts via stdin instead of passing as CLI args, filters out noisy
rollout stderr warnings, and extracts error/turn.failed messages from
JSONL output. Also broadens stale session detection for rollout path
errors. Claude-local adapter gets the same template vars (agentId,
companyId, runId) that codex-local already had.

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

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

@@ -0,0 +1,32 @@
+import { describe, expect, it } from "vitest";
+import { isCodexUnknownSessionError, parseCodexJsonl } from "@paperclip/adapter-codex-local/server";
+
+describe("codex_local parser", () => {
+  it("extracts session, summary, usage, and terminal error message", () => {
+    const stdout = [
+      JSON.stringify({ type: "thread.started", thread_id: "thread-123" }),
+      JSON.stringify({ type: "item.completed", item: { type: "agent_message", text: "hello" } }),
+      JSON.stringify({ type: "turn.completed", usage: { input_tokens: 10, cached_input_tokens: 2, output_tokens: 4 } }),
+      JSON.stringify({ type: "turn.failed", error: { message: "model access denied" } }),
+    ].join("\n");
+
+    const parsed = parseCodexJsonl(stdout);
+    expect(parsed.sessionId).toBe("thread-123");
+    expect(parsed.summary).toBe("hello");
+    expect(parsed.usage).toEqual({
+      inputTokens: 10,
+      cachedInputTokens: 2,
+      outputTokens: 4,
+    });
+    expect(parsed.errorMessage).toBe("model access denied");
+  });
+});
+
+describe("codex_local stale session detection", () => {
+  it("treats missing rollout path as an unknown session error", () => {
+    const stderr =
+      "2026-02-19T19:58:53.281939Z ERROR codex_core::rollout::list: state db missing rollout path for thread 019c775d-967c-7ef1-acc7-e396dc2c87cc";
+
+    expect(isCodexUnknownSessionError("", stderr)).toBe(true);
+  });
+});