Key-source contexts carry the op token and progress; DiscSession gains
open_with, scan_with and finish on the held handle. A consumer that
closes after a cancel keeps *.partial, and an artifact lock sidecar
guards each final output. Stop rules are enforced as lint tests.
Waits are halt-aware on a stall timer; every CDB carries the op token;
prefetchers and pipeline joins honour Stop; flush is durable with
measured progress; the macOS shim open is cancellable. Also: CPI is
cleared on every decrypted unit, FMTS phase verification, the HD DVD
declared CPS count, AES work hoisted out of AACS hot paths, and the
last production unsafe removed.
Matthew Jackson