Normalize agent attachment output (#122)

src/agent-protocol.ts

@@ -1,15 +1,18 @@
 export {
+  extractMarkdownImageAttachments,
   extractImageTagPaths,
   IMAGE_TAG_RE,
   IPC_CLOSE_SENTINEL,
   IPC_INPUT_SUBDIR,
   IPC_POLL_MS,
+  normalizeAgentOutput,
   normalizeEjclawStructuredOutput,
   normalizePublicTextOutput,
   OUTPUT_END_MARKER,
   OUTPUT_START_MARKER,
   writeProtocolOutput,
   type NormalizedRunnerOutput,
+  type NormalizedAgentOutput,
   type RunnerOutputAttachment,
   type RunnerOutputPhase,
   type RunnerOutputVerdict,