feat(cli): add real-time streaming support to run command with tool execution visibility

- Added message.part.updated event handling for incremental text streaming
- Added tool.execute event to display tool calls with input previews
- Added tool.result event to show truncated tool result outputs
- Enhanced EventState with lastPartText and currentTool tracking
- Defined MessagePartUpdatedProps, ToolExecuteProps, ToolResultProps types
- Updated event tests to cover new state fields

This enables the CLI run command to display real-time agent output similar to the native opencode run command, improving user experience with immediate feedback on tool execution.

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

src/cli/run/events.test.ts

@@ -16,13 +16,15 @@ async function* toAsyncIterable<T>(items: T[]): AsyncIterable<T> {
 }
 
 describe("createEventState", () => {
-  it("creates initial state with mainSessionIdle false and empty lastOutput", () => {
+  it("creates initial state with correct defaults", () => {
     // #given / #when
     const state = createEventState()
 
     // #then
     expect(state.mainSessionIdle).toBe(false)
     expect(state.lastOutput).toBe("")
+    expect(state.lastPartText).toBe("")
+    expect(state.currentTool).toBe(null)
   })
 })
 
@@ -73,6 +75,8 @@ describe("event handling", () => {
     const state: EventState = {
       mainSessionIdle: true,
       lastOutput: "",
+      lastPartText: "",
+      currentTool: null,
     }
 
     const payload: EventPayload = {