fix: throttle progress edits via 5s ticker, prevent Discord rate limit

- Remove per-tool-activity sync calls (was flooding Discord with edits)
- Ticker-only sync at 5s intervals for time + tool activity updates
- Summary updates heading directly when progress message exists
- Prevent duplicate progress message creation with progressCreating flag

runners/agent-runner/src/index.ts

@@ -558,7 +558,7 @@ async function runQuery(
       if (summary) {
         writeOutput({
           status: 'success',
-          phase: 'tool-activity',
+          phase: 'progress',
           result: `📋 ${summary}`,
           newSessionId,
         });