feat(config): update task config schema for global storage

- Make storage_path truly optional (remove default)
- Add task_list_id as config alternative to env var
- Fix build-schema.ts to use zodToJsonSchema

🤖 Generated with assistance of OhMyOpenCode

src/config/schema.ts

@@ -368,8 +368,10 @@ export const TmuxConfigSchema = z.object({
 })
 
 export const SisyphusTasksConfigSchema = z.object({
-  /** Storage path for tasks (default: .sisyphus/tasks) */
-  storage_path: z.string().default(".sisyphus/tasks"),
+  /** Absolute or relative storage path override. When set, bypasses global config dir. */
+  storage_path: z.string().optional(),
+  /** Force task list ID (alternative to env ULTRAWORK_TASK_LIST_ID) */
+  task_list_id: z.string().optional(),
   /** Enable Claude Code path compatibility mode */
   claude_code_compat: z.boolean().default(false),
 })