Function update_plugins 

pub fn update_plugins(
    names: &[String],
    bump_type: Option<&str>,
    config: &MarketplaceConfig,
) -> Result<Vec<String>, SoukError>

Updates the named plugins in the marketplace by re-reading their plugin.json from disk.

For each name in names:

• Resolves the plugin to its directory via the marketplace source
• Re-reads plugin.json
• Updates the marketplace entry (name, tags)
• If bump_type is specified (“major”, “minor”, or “patch”), bumps the version in the plugin’s plugin.json file
• Re-validates the plugin after update

The marketplace version is always bumped (patch) at the end.

Errors

Returns SoukError::PluginNotFound if any name does not exist in the marketplace.

Returns SoukError::AtomicRollback if post-update validation fails.