feat(agent): Implement a skill for automated batch manifest deletion

Signed-off-by: ❤是纱雾酱哟～ <49941141+Dragon1573@users.noreply.github.com>

Author: Dragon1573

.agent/skills/winget-removal/SKILL.md

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+---
+name: winget-removal
+description: Use AI Agents to remove a group of WinGet Manifests in batch
+---
+
+# winget-removal
+
+Instructions for the agent to follow when this skill is activated.
+
+## When to use
+
+When user ask for removing a (group of) WinGet manifests, the skill should be automatically called for performing the batch removal.
+
+## Prerequisites
+
+1. Make sure if `winget.exe` is installed on user's device.
+2. Since this repository is huge and full of tiny YAML files, _Sparse Checkout_ feature of Git might enabled. Detect this by checking Git repository-level and global-level settings.
+3. If the _Sparse Checkout_ is enabled. Make sure manifest files are available under `manifests` folder (maybe stored in recursive sub-folders) before invoking the removal script.
+   - If those manifests are already available on disk, **DO NOT EDIT** sparse checkout folder list.
+   - If those manifests aren't available to you, you're permitted to edit `.git/info/sparse-checkout` folder list relative to the repository root folder.
+   - After any changes of the list, perform `git sparse-checkout reapply` to apply the changes.
+
+## Instructions
+
+1. Inspect package identifier of package name from user's prompt, as `<keyword>` here.
+3. Get all available versions via `winget.exe search -s winget <keyword>`
+   - If user explicitly say it's a package identifier, first try adding `--id` switch before `<keyword>` for searching.
+   - For above sub-rules failed, or you get an empty response, try without adding extra switches.
+   - If searched package identifier **ISN'T EXACTLY MATCH** what was been inferred by user, pause and ask for user's clarification.
+4. Check which version(s) user want to remove.
+   1. If he/she didn't explicitly mentioned, pause here and ask for clear instructions. **DO NOT ACT WITHOUT KNOWING EXPLICITLY VERSION RANGE!**
+   2. If user provide a fuzzy natural language "version range", try map it to exact array of versions.
+5. Invoke `Remove-Package.ps1` for actual removal.
+   - The PowerShell script is stored at `./templates/Remove-Package.ps1`, **relative to this Markdown file**.
+   - Pass `-PackageIdentifier` string for telling with package to remove.
+   - Pass `-Versions` array for telling exact versions to remove.
+   - Pass `-IssueId` integer to link the pull request to a known issue.
+   - Pass `-Assistant` with AI agent specific attribution.
+
+## AI agent specific attribution guidelines
+
+> ### Attribution
+>
+> When AI tools contribute to the repository, proper attribution helps track the evolving role of AI in the manifest maintenance process. Contributions should include an `Assisted-by` tag in the following format:
+>
+> ```txt
+> Assisted-by: AGENT_NAME:MODEL_VERSION [TOOL1] [TOOL2]
+> ```
+>
+> Where:
+>
+> - `AGENT_NAME` is the name of the AI tool or framework
+> - `MODEL_VERSION` is the specific model version used
+> - `[TOOL1] [TOOL2]` are optional specialized analysis tools used (e.g., `Komac`, `Sundry`, `WinGetCreate`, `YamlCreate`)
+>
+> Basic tools (`git`, editors) **SHOULD NOT** be listed.

.agent/skills/winget-removal/templates/Remove-Package.ps1

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+[CmdletBinding()]
+param (
+    [Parameter(Mandatory = $true)]
+    [string]
+    $PackageIdentifier,
+    [Parameter()]
+    [string[]]
+    $Versions,
+    [Parameter(Mandatory = $true)]
+    [int]
+    $IssueId,
+    [Parameter()]
+    [string]
+    $AssistantFooter
+)
+
+foreach ($v in $Versions) {
+    $branchName = "issues/$IssueId/$($v -creplace " ", "-")/drop"
+    $title = "Remove version: $PackageIdentifier version $v"
+    $body = @"
+## ✅ Checklist
+
+- [x] Signed the [Contributor License Agreement](https://cla.opensource.microsoft.com)
+- [x] Linked to an issue (if applicable)
+  - Resolves #$IssueId
+
+## 📦 Manifest Checklist
+
+- [x] Checked that there aren't other open [pull requests](https://github.com/microsoft/winget-pkgs/pulls) for the same manifest update/change
+- [x] This PR only modifies one (1) manifest
+- [x] It's about manifest removal
+
+"@
+
+    # 完成 Git Commit 提交与推送
+    git.exe switch --create $branchName --no-track "upstream/master"
+    git.exe rm -r --sparse "manifests/$($PackageIdentifier[0].ToString().ToLower())/$($PackageIdentifier -creplace "\.", "/")/$v"
+    if ($AssistantFooter -ne "") {
+        $messages = $title + "`n`n" + $AssistantFooter
+    }
+    else {
+        $messages = $title
+    }
+    git.exe commit -vsS -m $messages
+    git.exe push --progress --set-upstream origin $branchName
+    gh.exe pr create --no-maintainer-edit --title $title --body $body
+    git.exe switch master
+    git.exe branch -d $branchName
+    Write-Host "----- Above Task Done -----"
+}

.gemini

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+.agent