Update dataset README (143 rows across hourly parts)

Update hourly manifest (143 total rows)

Append 143 rows to 2026-06-17T05 (143 in hour file)

Update dataset README (73 rows across hourly parts)

Update hourly manifest (73 total rows)

Append 73 rows to 2026-06-17T05 (73 in hour file)

Update dataset README (3 rows across hourly parts)

Update hourly manifest (3 total rows)

Append 3 rows to 2026-06-17T05 (3 in hour file)

initial commit