feat(events): HITL approvals emit the agent event schema

[jakedipity]

The five approval publish sites in the decision route build AgentEvents and go through agent_events::emit, alongside the other producers that reach consumers via a broker.

Ref: #624

[greptile-apps]

Greptile Summary

The PR migrates five HITL approval lifecycle publication sites to the unified agent-event schema while preserving delivery through the existing approval broker.

• Wraps requested, pending, and completed approval payloads in AgentEvent.
• Routes webhook and conversational approval events through agent_events::emit.
• Retains request-keyed delivery and the existing client-facing approval payloads.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/aura/src/hitl/route.rs	Migrates five approval lifecycle publications to the agent-event emitter, whose adapter preserves the existing approval-broker payload and routing behavior.

Sequence Diagram

sequenceDiagram
    participant H as HITL decision route
    participant E as agent_events::emit
    participant B as Approval event broker
    participant S as Web or CLI stream
    H->>E: AgentEvent with approval payload
    E->>B: ApprovalLifecycleEvent keyed by request ID
    B->>S: Requested, pending, or completed event

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