refactor(events): define orchestration SSE frames once

[jakedipity]

refactor(events): define orchestration SSE frames once
The producer and consumer each declared their own copy of OrchestrationStreamEvent, and they disagreed: plan_created did not parse, and iteration_complete bound to synthesizing. aura-events now holds the single definition, matching what the server emits, and the aura copy re-exports it. RoutingMode and IterationTimings move with it.

Emitted frames are unchanged; only the parsing side is corrected.

Ref: #623

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feat(events): orchestration emits the agent event schema
Orchestration carried its own OrchestratorEvent enum between the orchestrator and the SSE projection. Its variants move onto AgentEventPayload, so orchestrated and single-agent runs share one vocabulary, and StreamItem carries that payload directly.

Emitted frames are unchanged; the projection reads the same field sets under a different type.

Ref: #623

[greptile-apps]

Greptile Summary

The PR centralizes orchestration event payloads and SSE frame definitions in aura-events, then updates the runtime and web projection to use the shared schema.

• Moves orchestration payload variants onto AgentEventPayload.
• Re-exports shared routing, timing, context, and SSE frame types.
• Updates orchestration producers, stream transport, persistence, and tests to use the unified event vocabulary.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/aura-events/src/agent.rs	Extends the shared agent payload vocabulary with orchestration, task attribution, and unified outcome fields.
crates/aura-events/src/orchestration.rs	Centralizes orchestration SSE frame types, constructors, routing modes, and iteration timings.
crates/aura/src/orchestration/orchestrator.rs	Replaces the private orchestration event enum with enveloped shared AgentEvent payloads.
crates/aura-web-server/src/streaming/handlers.rs	Projects shared AgentEvent payloads into the centralized orchestration SSE frame schema.
crates/aura/src/orchestration/stream_events.rs	Re-exports the centralized orchestration stream definitions while retaining local serialization tests.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  O[Orchestration runtime] --> A[AgentEvent]
  A --> P[AgentEventPayload]
  P --> H[Web stream projection]
  H --> S[Shared OrchestrationStreamEvent]
  S --> C[CLI and SSE consumers]

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