fix: restore Blackboard CLI submission and release 0.11.1

[aprylewu]

Blackboard Classic/Original submissions now use a fresh, target-validated HTTP form with the CAS session and one multipart POST, followed by REST verification of a single new submitted attempt. An initial attempts-list 404 is accepted as an empty history only when the exact assignment's read-only view exposes a matching blank first-submission form. The CLI preserves hash binding and explicit confirmation, sanitizes error details, and never replays an uncertain POST or a redirect.

This release updates package, runtime and changelog versions to 0.11.1 and makes the offline form fixture import portable on Windows.

Validation:

• Typecheck, 452 tests, version checks and package-content checks passed.
• All six Ubuntu/macOS/Windows CI jobs on Node 20/22 passed, including package dry-runs and native credential checks where applicable.
• An authorized individual Original file resubmission passed live CLI submission and REST read-back on 2026-09-11. Text submission and first-submission 404 recovery remain fixture-tested only.