[liangmiQwQ]

Stacked on #3424, so the diff includes its changes until it is merged.

The current vp create <create-xxx template> asks about agent instructions, editor configs, git, and commit hooks before the create-xxx CLI runs. These prompts come before the template's own prompts, and they cannot know what the template is going to generate.

This PR moves these prompts after the create-xxx CLI finishes and makes them check the generated project. The package manager choice stays where it is, because it decides which package manager launches the create-xxx CLI.

• Agents: asks which agent instruction files to create. If the template already generated one, asks whether to append to it or skip.
• Editors: asks which editor configs to write. If the template already generated editor configs, they are merged without further questions.
• Git: asks only when the template did not initialize a repository. It is still skipped when adding a package to an existing monorepo.
• Hooks: asks whether to set up commit hooks, also when the repository came from the template.

Built-in and bundled @org templates keep asking up front. Non-interactive runs resolve the same choices as before.

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