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/ui/parse-stdout.ts

@@ -0,0 +1,73 @@
+import type { TranscriptEntry } from "@paperclip/adapter-utils";
+
+function safeJsonParse(text: string): unknown {
+  try {
+    return JSON.parse(text);
+  } catch {
+    return null;
+  }
+}
+
+function asRecord(value: unknown): Record<string, unknown> | null {
+  if (typeof value !== "object" || value === null || Array.isArray(value)) return null;
+  return value as Record<string, unknown>;
+}
+
+export function parseCodexStdoutLine(line: string, ts: string): TranscriptEntry[] {
+  const parsed = asRecord(safeJsonParse(line));
+  if (!parsed) {
+    return [{ kind: "stdout", ts, text: line }];
+  }
+
+  const type = typeof parsed.type === "string" ? parsed.type : "";
+
+  if (type === "thread.started") {
+    const threadId = typeof parsed.thread_id === "string" ? parsed.thread_id : "";
+    return [{
+      kind: "init",
+      ts,
+      model: "codex",
+      sessionId: threadId,
+    }];
+  }
+
+  if (type === "item.completed") {
+    const item = asRecord(parsed.item);
+    if (item) {
+      const itemType = typeof item.type === "string" ? item.type : "";
+      if (itemType === "agent_message") {
+        const text = typeof item.text === "string" ? item.text : "";
+        if (text) return [{ kind: "assistant", ts, text }];
+      }
+      if (itemType === "tool_use") {
+        return [{
+          kind: "tool_call",
+          ts,
+          name: typeof item.name === "string" ? item.name : "unknown",
+          input: item.input ?? {},
+        }];
+      }
+    }
+  }
+
+  if (type === "turn.completed") {
+    const usage = asRecord(parsed.usage) ?? {};
+    const inputTokens = typeof usage.input_tokens === "number" ? usage.input_tokens : 0;
+    const outputTokens = typeof usage.output_tokens === "number" ? usage.output_tokens : 0;
+    const cachedTokens = typeof usage.cached_input_tokens === "number" ? usage.cached_input_tokens : 0;
+    return [{
+      kind: "result",
+      ts,
+      text: "",
+      inputTokens,
+      outputTokens,
+      cachedTokens,
+      costUsd: 0,
+      subtype: "",
+      isError: false,
+      errors: [],
+    }];
+  }
+
+  return [{ kind: "stdout", ts, text: line }];
+}