Header helper commands set by an organization now build their environment only when needed

For a headersHelper command supplied by an organization, Claude Code now prepares the command's environment at the moment it is needed rather than ahead of time. A command's environment is the set of named values it receives when it starts. Before, that environment was always prepared upfront.

Claude Code also keeps a second copy of the environment, without the extra values that come from the current context. It uses this copy when comparing the command with ones supplied by plugins.