feat(skills): manage-teams + pptx 工具名对齐 PascalCase

跟随主仓库 desirecore PR #529（内置工具命名 PascalCase 化），同步以下 skill
中的工具引用：

- manage-teams (1.2.2 → 1.2.3)：
  - manage_team(...) → ManageTeam(...)
  - delegate(...) → Delegate(...)
  - 段落正文中"使用 delegate 工具" / "直接 delegate" / "临时 delegate" → Delegate

- pptx (1.0.2 → 1.0.3)：
  - editing.md 步骤 5 与"Editing Content"段中 "delegate tool" → Delegate tool

manifest.json: stats.lastUpdated 同步到今日。

兼容性：主仓库已通过 BuiltinToolDefinition.aliases 字段保留 manage_team /
delegate 等历史名作为 alias，旧 SKILL.md 仍然可用；本次更新让 SKILL 内的
代码示例与主名一致，避免 LLM 在调用时混用两种风格。

skills/pptx/editing.md

@@ -35,7 +35,7 @@ When using an existing presentation as a template:
    - **Complete all structural changes before step 5**
 
 5. **Edit content**: Update text in each `slide{N}.xml`.
-   **Use delegate tool here if available** — slides are separate XML files, so delegated agents can edit in parallel.
+   **Use Delegate tool here if available** — slides are separate XML files, so delegated agents can edit in parallel.
 
 6. **Clean**: `python scripts/clean.py unpacked/`
 
@@ -112,7 +112,7 @@ Slide order is in `ppt/presentation.xml` → `<p:sldIdLst>`.
 
 ## Editing Content
 
-**Delegation:** If the delegate tool is available, use it here (after completing step 4). Each slide is a separate XML file, so delegated agents can edit in parallel. In your prompt to delegated agents, include:
+**Delegation:** If the Delegate tool is available, use it here (after completing step 4). Each slide is a separate XML file, so delegated agents can edit in parallel. In your prompt to delegated agents, include:
 - The slide file path(s) to edit
 - **"Use the Edit tool for all changes"**
 - The formatting rules and common pitfalls below