Add CLIAdapterModule with pretty JSONL formatting

New src/cli/format-event.ts handles formatting OpenCode JSONL events:
- step_start: skip in normal mode, show in debug
- text: display as-is
- tool_use: show errors, skip in normal mode
- step_finish: show message + tokens/cost in debug
- error: display error message

Exports cliAdapter.formatStdoutEvent for Paperclip UI to call.
Also fixes ui-parser.ts to re-export from format-event.ts.

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

src/ui-parser.ts

@@ -3,32 +3,7 @@
  * Zero external imports — required by the Paperclip adapter plugin UI parser contract.
  */
 
-type TranscriptEntry =
-  | { kind: "stdout"; ts: string; text: string }
-  | { kind: "stderr"; ts: string; text: string }
-  | { kind: "system"; ts: string; text: string };
+import type { TranscriptEntry } from "@paperclipai/adapter-utils";
+import { parseStdoutLine } from "./cli/format-event.js";
 
-export function parseStdoutLine(line: string, ts: string): TranscriptEntry[] {
-  const trimmed = line.trim();
-  if (!trimmed) return [];
-
-  // Try to parse as JSONL event from opencode run --format json
-  try {
-    const event = JSON.parse(trimmed);
-    const type = typeof event.type === "string" ? event.type : "";
-    const part = typeof event.part === "object" && event.part !== null ? event.part : {};
-
-    if (type === "text" && typeof part.text === "string" && part.text.trim()) {
-      return [{ kind: "stdout", ts, text: part.text.trim() }];
-    }
-
-    // Skip non-display event types
-    if (type === "step_start" || type === "step_finish" || type === "tool_use") {
-      return [];
-    }
-  } catch {
-    // Not JSON — treat as raw stdout
-  }
-
-  return [{ kind: "stdout", ts, text: trimmed }];
-}
+export { parseStdoutLine };