Memory context can now refresh at the start of a turn, and startup syncs skills early

What

Cowork memory context is stored background information Claude can draw on. It used to be fetched only when a turn ended (turn_end). A turn is one round of you sending a message and Claude answering.

• The fetch can now also happen while a turn is being prepared (prepare_turn). It is recorded as memory_context_prepare_turn_get.
• The fetch now returns a reason when it does not run, such as person_paused, route_stopped or flags_not_loaded.
• A setting for the refresh window now returns NaN, meaning not a number, when it cannot be read.
• Headless startup, where Claude Code runs with no interactive screen, now runs a second early sync, early_skills_sync, next to the existing early_plugins_sync. It runs under the same conditions, including the one involving CLAUDE_CODE_ENABLE_PROXY_AUTH_HELPER. Skills are packaged instructions that extend what Claude can do.

Why

These are new background fetches at startup and before turns. In cloud sessions they may change how long startup and each turn take, and how up to date the memory context is when Claude starts answering.