Grok Build Src c2ad97f87aea

• [changed] Interactive shell/PTY terminal support now lives in a dedicated xai-grok-shell-terminal crate instead of inside xai-grok-shell.
• [new] [subagents] sampling_limit caps concurrent in-flight subagent sampling calls per process (default follows max_concurrent when unset; override with GROK_SUBAGENT_SAMPLING_LIMIT).
• [changed] Status line can render in minimal mode (under the prompt info row), not only in the full-screen pager.
• [changed] Sending a new message while a foreground command is running backgrounds that command instead of killing it (Ctrl+B remains the explicit background shortcut).
• [changed] Double-Esc on an idle non-empty prompt still clears and stashes the draft for Ctrl+S / Alt+S restore and ranks it first in ↑ history browse.
• [new] Workspace hub auth supports proactive OIDC refresh (GROK_WORKSPACE_OIDC_* interval, fraction, jitter, and safety-margin settings).
• [new] Workspace path virtualization support.
• [changed] Startup telemetry phase names use config_load and worker_spawn (replacing load_config / spawn_worker).
• [fixed] Pager event-loop stall and cancel-latency handling tightened so heavy subagent/history loads are less likely to freeze the UI.

Docs

• Keyboard shortcuts — double-Esc clear/stash wording aligned with current stash and history-browse behavior.
• Configuration — documents [subagents] sampling_limit and GROK_SUBAGENT_SAMPLING_LIMIT.
• Background tasks — notes that a mid-command follow-up message backgrounds the running command.
• Status line — placement in full-screen vs minimal mode; troubleshooting no longer claims the row is absent in minimal mode.
• Monitoring usage — phase_duration step names updated to config_load and worker_spawn.

Under the hood

• New workspace member xai-grok-shell-terminal (and matching Cargo.lock entry); terminal modules removed from xai-grok-shell.
• Workspace hub auth split into a hub_auth module with proactive refresh.
• Additional pager instrumentation/tests around cancel latency and event-loop stalls.
• New internal env knobs for subagent sampling, workspace OIDC refresh, and workspace WS liveness.

Upgrade notes

• Rebuild from a clean workspace so the new crates/codegen/xai-grok-shell-terminal member is picked up.
• If you scrape startup telemetry, rename filters from load_config / spawn_worker to config_load / worker_spawn.
• Optional: set [subagents] sampling_limit (or GROK_SUBAGENT_SAMPLING_LIMIT) when running many concurrent subagents.