Keep offline peers on Fleet and add max reconnect tries setting

Fleet builds a roster from configured peers so hosts stay visible when
they drop (online / reconnecting / failed / offline). Settings → Behavior
adds max reconnect tries (1–8 or unlimited, default 8) wired into
ConnectionManager, with Retry connect to redial after the budget is spent.

config.js

@@ -25,8 +25,9 @@ export const CONFIG = {
     /** Fixed delay between automatic peer reconnect attempts */
     RECONNECT_DELAY_MS: 5000,
     /**
-     * Max automatic reconnect attempts (0 / Infinity = never give up).
-     * Peers keep dialing every RECONNECT_DELAY_MS until back online or removed.
+     * Default max automatic reconnect attempts when Settings has no override.
+     * 0 = unlimited. Runtime/UI caps at 8 (see Settings → Behavior).
+     * Client default preference is 8 tries via peardock.settings.v1.
      */
     RECONNECT_MAX_ATTEMPTS: 0,
     HEALTH_CHECK_INTERVAL_MS: 10000,  // Health check interval