AIWF v1.7.11

Release Type

Fail-closed task creation identity safety correction.

Made new-task create-only; --update-existing now fails before writing files.
Rejected same-date duplicate normalized task names before task ID allocation.
Added AIWF-TASK-NAME-001 diagnostics with exact existing task paths.
Made check, doctor, and finalize block on pre-existing same-date duplicate names.
Added focused regression coverage for zero-side-effect failure, cross-date compatibility, and diagnostics.

Workflow protocol remains 1.7.8.
Backfill and knowledge-template --update-existing behavior is unchanged.
No event schema, finalize semantics, phase state machine, locking, repair, or historical-record migration was added.