Build a 4-line summary from a structured log CSV.
CSV header: `timestamp,level,user,message` where `timestamp` is ISO like `2024-01-01T09:01`.
Print exactly four lines:
```
TOTAL: <total rows>
ERRORS: <rows where level == "ERROR">
TOP_USER: <user with most rows; ties → alphabetic first>
TOP_HOUR: <hour HH (chars 11-13) with most rows; ties → alphabetic first>
```
Test input:
timestamp,level,user,message
2024-01-01T09:01,INFO,alice,hi
2024-01-01T09:05,ERROR,bob,fail
2024-01-01T10:00,INFO,alice,ok
2024-01-01T10:30,ERROR,alice,boom
2024-01-01T10:45,WARN,bob,slow
Expected output:
TOTAL: 5
ERRORS: 2
TOP_USER: alice
TOP_HOUR: 10
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