feat(cli-run): add streaming delta, think block rendering, and rich tool headers

Adds message.part.delta event handling for real-time streaming output,
reasoning/think block display with in-place updates, per-agent profile
colors, padded text output, and semantic tool headers with icons.

🤖 Generated with [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/cli/run/event-stream-processor.ts

@@ -7,6 +7,7 @@ import {
   handleSessionIdle,
   handleSessionStatus,
   handleMessagePartUpdated,
+  handleMessagePartDelta,
   handleMessageUpdated,
   handleToolExecute,
   handleToolResult,
@@ -38,6 +39,7 @@ export async function processEvents(
       handleSessionIdle(ctx, payload, state)
       handleSessionStatus(ctx, payload, state)
       handleMessagePartUpdated(ctx, payload, state)
+      handleMessagePartDelta(ctx, payload, state)
       handleMessageUpdated(ctx, payload, state)
       handleToolExecute(ctx, payload, state)
       handleToolResult(ctx, payload, state)