fix: 移除 self-evolve 和 task-management 的 requires 声明

这些工具依赖在当前阶段无法满足（desirecore Agent 尚未注册
read_file/write_file/edit_file/list_directory/fetch_api），
导致 context-assembler 每次启动都输出依赖缺失警告。

移除 requires 声明，待工具注册体系完善后再按需添加。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/task-management/SKILL.md

@@ -6,12 +6,6 @@ type: procedural
 risk_level: low
 status: enabled
 disable-model-invocation: false
-requires:
-  tools:
-    - fetch_api
-  optional_tools:
-    - read_file
-    - list_directory
 tags: [task, management, orchestration]
 metadata:
   author: desirecore