The NFL’s “legal tampering period” in free agency began Monday with a slew of deals even as many teams released veterans to clear salary cap space before the league’s business year begins Wednesday. Most aggressive was the worst team in the league. The Jacksonville Jaguars, which has the first overall selection in the draft next month for the second straight year, got busy early. The Jaguars agreed to sign Arizona receiver Christian Kirk, Washington guard Brandon Scherff, Atlanta linebacker Foyesade Oluokun and New York Jets defensive tackle Folorunso “Foley” Fatukasi, according to a person familiar with negotiations. All four newcomers should be starters. Kirk figures to replace DJ Chark as Trevor Lawrence’s top target. Scherff has been a dependable blocker when healthy in Washington. Oluokun led the Falcons with 192 tackles last season, and Fatukasi is a force against the run. Also agreeing to move on were New England cornerback J.C. Jackson to the Los Angeles Chargers; linebac...