Remote session keep-alive and event-hold handling reworked

What

A remote session is one where Claude Code runs on a cloud machine instead of your own computer. A keep-alive is a small signal that tells the server the session is still working. Several parts of how these sessions start, stay alive and send their events changed together.

• Startup without stored state: when a worker registers and its read of stored worker state (GET /worker) has not finished, that read can now be abandoned. Claude Code logs that it is continuing without the stored worker state.
• Keep-alive at work start: a new keepAliveAtWorkStart option starts a keep-alive timer when work begins. It applies to sessions that own their process and depends on model calls, tool runs and hook runs.
• Work-only state: the keep-alive timer is skipped, and an active one ends, when a helper reports that only work-only tasks remain.
• Classifier keep-alives: these still need the CLAUDE_CODE_REMOTE_SEND_KEEPALIVES environment variable. They used to also need the tengu_ccr_classifier_keepalive_enabled server flag, but now also run when a second check passes, even if that flag is false. What the second check tests was not resolved.
• New keep-alive gate: a new helper turns keep-alives on only when CLAUDE_CODE_REMOTE_SEND_KEEPALIVES is set, a check passes, tengu_encapsulated_honey evaluates to "on", and another check does not trip. Nothing has been read yet about this gate.
• Event hold: the eventHoldEnabled option, which read the server flag tengu_ccr_event_hold_enabled with a fallback of true, is replaced by a fixed followsServedPolicy: true. The client's mergesSameRun and waitsForStatus now check followsServedPolicy.
• Headless session fields: pulseKeepAlive is replaced by sessionSignal and keepAlive, and hasLiveSessionWakeup is added. This suggests a rework of idle and wake-up handling in sessions that run without a screen.

Why

Remote sessions can start sooner when the stored-state read is slow, and they keep alive or stop keeping alive under different rules. Event holding is now built in rather than controlled by a server switch, so it can no longer be turned off from the server for this build.