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Jaana Dogan
233820befc
Make Task manifests fully immutable once created, removing `UpdateTask` in favor of `CreateTask` and driving lifecycle transitions (suspend, resume, delete) through dedicated RPCs and event stream processing. - Proto: Replace `UpdateTask` with `CreateTask` in AX service. - Proto: Remove mutable `suspend` field from `TaskSpec` and reserve field 2. - API / Server: Implement `CreateTask` with duplicate name rejection (`codes.AlreadyExists`). Update `SuspendTask`, `ResumeTask`, and `DeleteTask` to transition status phase and publish lifecycle events. - Store: Remove redundant `SetTaskSuspended` and `MarkTaskDeleting` methods; standardize on `CreateTask`, `UpdateTaskStatus`, `DeleteTask`, and `PublishEvent`. - Controller: Decouple spec reconciliation from task suspension; introduce `ReconcileSuspend` to handle checkpointing and pausing actors on Substrate. - CLI: Update `ax apply` to submit tasks via `CreateTask`. - Docs: Update design docs and specifications to reflect task immutability.