fix: cargo fmt corrections for relaycast_ws.rs

[barryonthecape]

Fixes format violations caught in CI for PR #601.

Changes:

• Reformats import block in relaycast_ws.rs to respect line length
• Splits long line in seeded_http_client function

This branch was derived from PR #601, so once merged to main it can be integrated into #601.

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[devin-ai-integration]

Devin Review found 1 potential issue.

View 5 additional findings in Devin Review.

[devin-ai-integration]

🟡 HTTP API relay_inbound events omit injection mode despite both SDKs reading it

When a message is sent via the HTTP API with mode: "steer", the relay_inbound events emitted to the SDK (lines 2150-2161 for local delivery, lines 2214-2225 for relaycast publish) do not include the mode or injection_mode field in their JSON payload, even though the mode variable is available in scope from ListenApiRequest::Send. Both the TypeScript SDK (packages/sdk/src/relay.ts:1016: mode: event.injection_mode ?? event.mode) and the Python SDK (packages/sdk-py/src/agent_relay/relay.py:782: mode=event.get("injection_mode") or event.get("mode")) explicitly read these fields from relay_inbound events, and the TypeScript protocol type at packages/sdk/src/protocol.ts:236-237 was updated to declare them. As a result, Message.mode will always be undefined/None for messages received via onMessageReceived, even when a dashboard user explicitly specified steer mode. The actual PTY delivery is unaffected since queue_and_try_delivery_raw correctly passes mode through RelayDelivery.

(Refers to lines 2150-2163)

Prompt for agents

In src/main.rs, the two relay_inbound event emissions in the HTTP API ListenApiRequest::Send handler need to include the injection mode. There are two locations:

1. Lines 2150-2163 (local delivery succeeded path): Add "injection_mode" to the json! macro, using the mode variable from the surrounding scope. The mode variable is of type MessageInjectionMode, which implements Serialize.

2. Lines 2214-2227 (relaycast publish succeeded path): Same fix — add "injection_mode" to the json! macro.

For both locations, add a field like:
  "injection_mode": mode,

into the json!({...}) block that constructs the relay_inbound event. The mode variable is already in scope from the ListenApiRequest::Send destructuring.

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