Match and post a clearing file's records

Verified staff on the card clearing desk's narrow scopes only: cards:clearing:read for reads, cards:clearing:write with a step-up within five minutes for writes; cards:write does not reach these routes and no service token or API key does. The file formats are bank-defined approximations of the proprietary Visa BASE II, Mastercard IPM and Discover clearing specifications (services/cards/clearing/README.md); a file from the card clearing simulator is simulated, not network traffic. Matches and posts every record without a disposition, in file order, through the existing clearing, refund and force post paths. The matching decision is captured before money moves, so a retry after a lost response repeats it. A refusal of the clearing path records the record as an exception; a failure a retry can finish (the ledger or accounts unavailable) stops the run with the records before it disposed, and the next call resumes. Processing a fully disposed file returns processed 0.