revert: remove temporary merge-reap diagnostic logging

Reverts the diagnostic introduced in 91b4e4ff. Will re-add when we
actively debug the disappearance bug again.

server/src/agents/pool/pipeline/merge/runner.rs

@@ -39,23 +39,10 @@ impl AgentPool {
                 if job.status != "running" {
                     continue;
                 }
-                let decoded = decode_server_start_time(job.error.as_deref());
+                let stale = match decode_server_start_time(job.error.as_deref()) {
-                let stale = match decoded {
                     Some(t) => t < current_boot,
                     None => true, // Legacy (pid-encoded) or malformed: stale
                 };
-                // DIAGNOSTIC: log the values being compared so we can see why
-                // fresh jobs are being marked stale. Remove once the disappearance
-                // bug is understood.
-                slog!(
-                    "[merge-reap] job='{}' status='{}' error={:?} decoded={:?} current_boot={} stale={}",
-                    job.story_id,
-                    job.status,
-                    job.error,
-                    decoded,
-                    current_boot,
-                    stale,
-                );
                 if stale {
                     slog!(
                         "[merge] Cleared stale Running merge job for '{}' (server restarted) — re-dispatching",