Agent Architecture Review, Snapshot di validazione

The workflow is structured around delegated intent and constraints: `Policy` captures amount caps, allow/blocklists, due window, run total, and required approver role; `create_run()`, `draft_tasks()`, and `execute_approved_payments()` let the system classify and execute eligible invoices under those constraints. Operator controls are explicit through `pause_run()`, `cancel_run()`, `resume_run()`, `retry_failed_task()`, and `reconcile_submitted_task()`.

Background work remains perceptible through persistent `RunLedger` events, `DurableOperatorInbox` alerts, explicit `RunStatus`/`TaskStatus` values, and `inspect_run()` summaries. Continuity is preserved by `replay_run_from_ledger()`, including promotion of unreconciled `SUBMITTED` tasks to `SUBMITTED_UNKNOWN` with a critical inbox alert.

Feedback is calibrated by channel: routine lifecycle changes are written as audit events, while intervention-required situations use `DurableOperatorInbox.post()` with warning/critical severity, including forged/expired approval envelopes, insufficient role, bank auth failure, reconciliation failure, policy submit blocks, and unfinished tasks after execution. `inspect_run()` surfaces `critical_alerts` without forcing the full ledger into the primary status view.

`inspect_run()` provides progressive disclosure: a primary run view with `status`, cancellation/pause fields, `critical_alerts`, `audit_chain_intact`, and a compact `summary` by task status, while deeper task-level fields and the full ledger are available through task entries, `RunLedger.read_run_events()`, and `verify_chain()`. This separates summary status from diagnostic inspection.

The code replaces implied automation with explicit mental models: `classify_invoice()` returns concrete policy-decision strings, `ApprovalEnvelope` binds approval to `run_id`, `task_id`, `policy_hash`, `invoice_snapshot_hash`, approver identity/role, and expiry, and `cron_draft_daily_run()` drafts only rather than auto-approving or auto-paying. Users can distinguish drafting, approval, execution, reconciliation, retry, and cancellation states.

Operational state is expressed in user-relevant enums such as `AWAITING_APPROVAL`, `PAUSED`, `EXECUTING`, `PARTIALLY_COMPLETED`, `FAILED`, `SUBMITTED_UNKNOWN`, and `CANCELLED`. The iteration-5 terminal check in `execute_approved_payments()` prevents `COMPLETED` when tasks remain `AWAITING_APPROVAL`, `APPROVED`, or `SUBMITTED_UNKNOWN`, preserving a meaningful green status.

Inspectability is supported by a hash-chained `AuditEvent` ledger with `sequence_no`, `prev_event_hash`, `event_hash`, actor, payload, and timestamps. Events record invoice snapshots, policy hashes, idempotency keys, approval signatures, task transitions, bank responses, and replay promotions; `verify_chain()` exposes tamper/divergence detection and `replay_run_from_ledger()` reconstructs run state from the audit trail.

Approval and blocker boundaries are explicit. `approve()` verifies the signed `ApprovalEnvelope`, role, policy hash, invoice snapshot hash, expiry, and task status; it now rejects approvals on `COMPLETED`, `FAILED`, or `CANCELLED` runs with a critical inbox alert and `PolicyViolation`. `execute_approved_payments()` counts unfinished `AWAITING_APPROVAL`, `APPROVED`, and `SUBMITTED_UNKNOWN` tasks before terminal transition and posts a critical `Run not completed: unfinished tasks remain` alert instead of falsely completing the run.

Delegated work is represented as a structured system rather than a conversation: `PaymentRun` and `PaymentTask` model the run/task graph, `self.tasks[run_id]` tracks subtasks, `RunLedger` captures the timeline, `DurableOperatorInbox` captures interventions, and `inspect_run()` renders status, summaries, task details, alerts, and audit-chain health.

The workflow supports steering after initiation through `pause_run()`, `resume_run()`, `cancel_run()`, `resume_after_failure()`, `retry_failed_task()`, and `reconcile_submitted_task()`. `execute_approved_payments()` checks `RunLedger.latest_steering_intent()` before each external submit, so cancellation or pause requests recorded in the durable ledger can interrupt the run before further bank calls.