feat(coding-agent): ResourceLoader, package management, and /reload command (#645)

- Add ResourceLoader interface and DefaultResourceLoader implementation
- Add PackageManager for npm/git extension sources with install/remove/update
- Add session.reload() and session.bindExtensions() APIs
- Add /reload command in interactive mode
- Add CLI flags: --skill, --theme, --prompt-template, --no-themes, --no-prompt-templates
- Add pi install/remove/update commands for extension management
- Refactor settings.json to use arrays for skills, prompts, themes
- Remove legacy SkillsSettings source flags and filters
- Update SDK examples and documentation for ResourceLoader pattern
- Add theme registration and loadThemeFromPath for dynamic themes
- Add getShellEnv to include bin dir in PATH for bash commands

packages/coding-agent/src/core/footer-data-provider.ts

@@ -85,6 +85,11 @@ export class FooterDataProvider {
 		}
 	}
 
+	/** Internal: clear extension statuses */
+	clearExtensionStatuses(): void {
+		this.extensionStatuses.clear();
+	}
+
 	/** Internal: cleanup */
 	dispose(): void {
 		if (this.gitWatcher) {