Early plugin sync at startup for remote sessions, behind an environment variable

What

Claude Code has a new step that syncs plugins (add-ons that extend Claude Code) early in startup, before the normal startup path. It appears aimed at remote sessions, which the members call CCR (Claude Code sessions that run on a hosted machine rather than your own computer).

• The step does nothing unless the environment variable CLAUDE_CODE_CCR_EARLY_PLUGINS_SYNC is set. An environment variable is a named setting passed to a program when it starts.
• It also does nothing in interactive sessions, where you type to Claude Code directly.
• It is skipped when a proxy auth helper is configured. A proxy auth helper is a program that supplies sign-in details for a network proxy, switched on with CLAUDE_CODE_ENABLE_PROXY_AUTH_HELPER.
• When the early sync runs, Claude Code records an early_plugins_sync marker in its logs.
• CLAUDE_CODE_CCR_EARLY_PLUGINS_SYNC was added to two lists of environment variables that Claude Code passes on to the processes it starts, so the setting reaches spawned or remote processes.

Why

This can change when plugins are ready during startup, but only for a process that has CLAUDE_CODE_CCR_EARLY_PLUGINS_SYNC set. Without that variable, startup works as before.