fix: stop redirecting stderr to logfile — HF captures stderr for logs

The 2>&1 redirect in background subshell was silencing stderr,
preventing HF from capturing sync daemon output. Use tee to split
output to both logfile AND stderr (for HF runtime log API).

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

scripts/entrypoint.sh

@@ -59,7 +59,7 @@ try:
 except:
     api.create_repo(repo_id=repo, repo_type='dataset', private=True)
     print(f'[entrypoint] Created dataset: {repo}', flush=True)
-" >> "$LOGFILE" 2>&1 || log "[entrypoint] WARNING: Could not verify dataset"
+" 2>&1 | tee -a "$LOGFILE" >&2 || log "[entrypoint] WARNING: Could not verify dataset"
 else
     log "[entrypoint] WARNING: persistence disabled (no token/repo)"
 fi
@@ -74,11 +74,12 @@ log "[entrypoint] Wrote /etc/huggingrun.env"
 
 # Background: init (download + restore) then start sync-loop
 # This runs AFTER services start so HF doesn't timeout
+# IMPORTANT: do NOT redirect stderr (2>&1) — HF captures stderr for runtime logs
 (
     log "[entrypoint:bg] Starting init in background ..."
-    python3 -u /opt/git_sync_daemon.py init >> "$LOGFILE" 2>&1
+    python3 -u /opt/git_sync_daemon.py init 2>&1 | tee -a "$LOGFILE" >&2
     log "[entrypoint:bg] Init done, starting sync-loop ..."
-    exec python3 -u /opt/git_sync_daemon.py sync-loop >> "$LOGFILE" 2>&1
+    python3 -u /opt/git_sync_daemon.py sync-loop 2>&1 | tee -a "$LOGFILE" >&2
 ) &
 BG_PID=$!
 log "[entrypoint] Background init+sync PID=${BG_PID}"