Clone plugin sources over HTTPS in CI

Set CLAUDE_CODE_PLUGIN_PREFER_HTTPS=1 to force HTTPS cloning for GitHub `owner/repo` plugin sources, bypassing the default SSH transport that fails without a configured SSH key.

bash

# Force HTTPS for plugin clones in CI runners and containers
CLAUDE_CODE_PLUGIN_PREFER_HTTPS=1 claude plugin install owner/repo

# Combine with a non-interactive install
CLAUDE_CODE_PLUGIN_PREFER_HTTPS=1 \
  claude plugin install owner/repo --yes

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