Move adapter implementations into shared workspace packages

Extract claude-local and codex-local adapter code from cli/server/ui
into packages/adapters/ and packages/adapter-utils/. CLI, server, and
UI now import shared adapter logic instead of duplicating it. Removes
~1100 lines of duplicated code across packages. Register new packages
in pnpm workspace.

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

packages/adapters/codex-local/src/server/parse.ts

@@ -0,0 +1,47 @@
+import { asString, asNumber, parseObject, parseJson } from "@paperclip/adapter-utils/server-utils";
+
+export function parseCodexJsonl(stdout: string) {
+  let sessionId: string | null = null;
+  const messages: string[] = [];
+  const usage = {
+    inputTokens: 0,
+    cachedInputTokens: 0,
+    outputTokens: 0,
+  };
+
+  for (const rawLine of stdout.split(/\r?\n/)) {
+    const line = rawLine.trim();
+    if (!line) continue;
+
+    const event = parseJson(line);
+    if (!event) continue;
+
+    const type = asString(event.type, "");
+    if (type === "thread.started") {
+      sessionId = asString(event.thread_id, sessionId ?? "") || sessionId;
+      continue;
+    }
+
+    if (type === "item.completed") {
+      const item = parseObject(event.item);
+      if (asString(item.type, "") === "agent_message") {
+        const text = asString(item.text, "");
+        if (text) messages.push(text);
+      }
+      continue;
+    }
+
+    if (type === "turn.completed") {
+      const usageObj = parseObject(event.usage);
+      usage.inputTokens = asNumber(usageObj.input_tokens, usage.inputTokens);
+      usage.cachedInputTokens = asNumber(usageObj.cached_input_tokens, usage.cachedInputTokens);
+      usage.outputTokens = asNumber(usageObj.output_tokens, usage.outputTokens);
+    }
+  }
+
+  return {
+    sessionId,
+    summary: messages.join("\n\n").trim(),
+    usage,
+  };
+}