feat(netinfra): prep LACP conversion commands for cross-rack trunk [#369]

The cross-rack trunk (ch1, 4×1G) between core-sw01 and tor3-stor is
still static mode=on — no failure detection if a cable dies. Adding
command files to convert both switches to LACP during Friday's
maintenance window. Core hash stays layer-2-3 (5448 hardware limit);
stor hash stays layer-2-3-4 (already set).

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

netinfra/switches/core-sw01-ch1-to-lacp.cmds

@@ -0,0 +1,25 @@
+! #369/#394: Convert cross-rack trunk ch1 from static (mode=on) to LACP
+! Switch: core-sw01 (Dell PowerConnect 5448, rack 5)
+! WHEN: Friday maintenance window — BOTH switches must change together
+! RISK: Brief storage-net outage during transition (seconds)
+!
+! Current: g13-g16 in ch1, mode=on (static, no failure detection)
+! Target:  g13-g16 in ch1, mode=auto (LACP active partner negotiation)
+!
+! NOTE: core-sw01 hash stays layer-2-3 (hardware limit — best available)
+!       tor3-stor hash stays layer-2-3-4 (already set)
+!
+! IMPORTANT: Run this SIMULTANEOUSLY with tor3-stor change.
+!   If one side is LACP and other is static, trunk goes down until
+!   both sides match. Plan for ~30s storage-net outage.
+!
+enable
+configure
+interface range ethernet g13-g16
+  no channel-group
+  channel-group 1 mode auto
+exit
+exit
+show interfaces status port-channel 1
+show lacp port-channel 1
+copy running-config startup-config