feat: add skills and subagents configuration support

- Updated .gitignore to include skills directory.
- Introduced agent discovery functionality to scan for AGENT.md files in user and project directories.
- Added new API endpoint for discovering filesystem agents.
- Implemented UI components for managing skills and viewing custom subagents.
- Enhanced settings helpers to retrieve skills configuration and custom subagents.
- Updated agent service to incorporate skills and subagents in task delegation.

These changes enhance the capabilities of the system by allowing users to define and manage skills and custom subagents effectively.

apps/server/src/lib/settings-helpers.ts

@@ -269,3 +269,60 @@ export async function getPromptCustomization(
     enhancement: mergeEnhancementPrompts(customization.enhancement),
   };
 }
+
+/**
+ * Get Skills configuration from settings.
+ * Returns configuration for enabling skills and which sources to load from.
+ *
+ * @param settingsService - Settings service instance
+ * @returns Skills configuration with enabled state, sources, and tool inclusion flag
+ */
+export async function getSkillsConfiguration(settingsService: SettingsService): Promise<{
+  enabled: boolean;
+  sources: Array<'user' | 'project'>;
+  shouldIncludeInTools: boolean;
+}> {
+  const settings = await settingsService.getGlobalSettings();
+  const enabled = settings.enableSkills ?? true; // Default enabled
+  const sources = settings.skillsSources ?? ['user', 'project']; // Default both sources
+
+  return {
+    enabled,
+    sources,
+    shouldIncludeInTools: enabled && sources.length > 0,
+  };
+}
+
+/**
+ * Get custom subagents from settings, merging global and project-level definitions.
+ * Project-level subagents take precedence over global ones with the same name.
+ *
+ * @param settingsService - Settings service instance
+ * @param projectPath - Path to the project for loading project-specific subagents
+ * @returns Record of agent names to definitions, or undefined if none configured
+ */
+export async function getCustomSubagents(
+  settingsService: SettingsService,
+  projectPath?: string
+): Promise<Record<string, import('@automaker/types').AgentDefinition> | undefined> {
+  // Get global subagents
+  const globalSettings = await settingsService.getGlobalSettings();
+  const globalSubagents = globalSettings.customSubagents || {};
+
+  // If no project path, return only global subagents
+  if (!projectPath) {
+    return Object.keys(globalSubagents).length > 0 ? globalSubagents : undefined;
+  }
+
+  // Get project-specific subagents
+  const projectSettings = await settingsService.getProjectSettings(projectPath);
+  const projectSubagents = projectSettings.customSubagents || {};
+
+  // Merge: project-level takes precedence
+  const merged = {
+    ...globalSubagents,
+    ...projectSubagents,
+  };
+
+  return Object.keys(merged).length > 0 ? merged : undefined;
+}