fix(monitor): replace catch unreachable with try in eternal_monitor.zig init

Replace catch unreachable with try for ArrayList initialization to properly
propagate allocation errors instead of crashing on OOM.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Trinity Agent

src/tri/eternal_monitor.zig

@@ -132,8 +132,8 @@ pub const EternalMonitor = struct {
         const monitor = try allocator.create(EternalMonitor);
         monitor.allocator = allocator;
         monitor.config = config;
-        monitor.components = std.ArrayList(SystemComponent).initCapacity(allocator, 16) catch unreachable;
-        monitor.alerts = std.ArrayList(Alert).initCapacity(allocator, 64) catch unreachable;
+        monitor.components = try std.ArrayList(SystemComponent).initCapacity(allocator, 16);
+        monitor.alerts = try std.ArrayList(Alert).initCapacity(allocator, 64);
         monitor.metrics = .{};
         monitor.start_time_ms = timestamp_ms();
         monitor.running = true;