v2.1.0

Added

• cs doctor — read-only reliability diagnosis with structured findings
  (project/package/version offline checks plus live service health), working
  before the Unity package is installed.
• cs wait-ready — poll until the editor service is genuinely ready
  (phase, compile/update flags, and the 2.1 main-thread heartbeat), with
  --expect-operation/--min-generation to bind the wait to one refresh
  operation and reject stale state from earlier generations.
• Play-mode compile deferral detection — when a waited refresh is deferred
  by the editor's Script Changes While Playing preference
  (recompile_after_finished), cs refresh --wait and cs wait-ready fail
  fast with editor.play_mode_deferring_compile instead of burning the
  timeout, and instruct the agent to ask the user before exiting play mode.

Changed

• cs refresh --wait readiness now binds to the triggered operation — the
  wait tracks the returned operation id and generation rather than the first
  ready phase mirror, so a service-restart blip can no longer report ready
  while the requested compile is still pending.
• references/refresh.md no longer recommends --exit-playmode by
  default — plain cs refresh --wait is the first choice; exiting play mode
  requires the user's approval because it discards runtime state.
• CLI version moves to 2.1.0 to stay on the same compatibility line as the
  Unity package's 2.1.0 health-field additions.