Fix wiki file deletions not propagated when using clone strategy

[Copilot]

When a file is deleted from the local wiki source directory, the corresponding page persisted in the GitHub wiki indefinitely. fs-extra.copy() only adds/overwrites files — it never removes destination files absent from the source.

Changes

• Clear wiki clone before copy: Before copying source files into the cloned wiki repo, all non-.git entries are removed in parallel. This makes the clone a clean slate so git add -Av captures deletions correctly.
• Use explicit d variable: The deletion loop references d directly rather than process.cwd(), consistent with how workspacePath is captured before process.chdir(d).

await Promise.all(
  (await readdir(d))
    .filter((entry) => entry !== ".git")
    .map((entry) => rm(resolve(d, entry), { recursive: true, force: true }))
);
// followed by the existing copy() call

No behavioral change for the init strategy — its working directory is already empty before the copy.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Action does not delete files in the wiki</issue_title>
<issue_description>When deleting a file in the /wiki dir and pushing, the relevant pages are not deleted</issue_description>

<agent_instructions>It seems like all operations except delete works. Unclear why; it does not seem like it has to do with the fact that it's a private repo.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@Andrew-Chen-Wang 1. do you have a reproduction? 2. does the action run successfully? 3. which version are you on?

• Fixes Action does not delete files in the wiki #87

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