Hooks can render custom status (#385)

* Add ctx.ui.setStatus(key, text) API for hooks to display status in footer

- Add setStatus to HookUIContext interface
- Implement in interactive mode (FooterComponent)
- Implement in RPC mode (fire-and-forget)
- Add no-op implementations for headless contexts
- Multiple statuses displayed on single line, sorted by key
- Supports ANSI styling (hooks handle their own colors)

* Remove setStatus from changelog for now

* Fix hook status API to follow TUI rules

- Sanitize status text: replace newlines, tabs, carriage returns with spaces
- Truncate combined status line to terminal width using truncateToWidth
- Update JSDoc to document sanitization and truncation behavior
- Remove unused createHookUIContext method
- Add missing setStatus to test mock

* Add setStatus to changelog

* Use dim ellipsis for hook status truncation for consistency with footer style

---------

Co-authored-by: Mario Zechner <badlogicgames@gmail.com>

packages/coding-agent/src/modes/interactive/interactive-mode.ts

@@ -371,6 +371,7 @@ export class InteractiveMode {
 			confirm: (title, message) => this.showHookConfirm(title, message),
 			input: (title, placeholder) => this.showHookInput(title, placeholder),
 			notify: (message, type) => this.showHookNotify(message, type),
+			setStatus: (key, text) => this.setHookStatus(key, text),
 			custom: (factory) => this.showHookCustom(factory),
 			setEditorText: (text) => this.editor.setText(text),
 			getEditorText: () => this.editor.getText(),
@@ -459,6 +460,14 @@ export class InteractiveMode {
 		this.ui.requestRender();
 	}
 
+	/**
+	 * Set hook status text in the footer.
+	 */
+	private setHookStatus(key: string, text: string | undefined): void {
+		this.footer.setHookStatus(key, text);
+		this.ui.requestRender();
+	}
+
 	/**
 	 * Show a selector for hooks.
 	 */