feat(powerman): add PDU outlet identification + rename scripts [#374]

identify-outlets.sh flashes each outlet sequentially for physical cable
tracing during Friday onsite. rename-outlets.sh takes a mapping file
and rewrites powerman.conf node entries. Both shellcheck-clean.

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Assisted-by: Crush:glm-5.2

dcinfra/powerman/identify-outlets.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/bash
+# powerman/identify-outlets.sh — flash each PDU outlet sequentially for physical tracing
+#
+# Run this from the workstation. It flashes each outlet one at a time so you
+# can walk the rack and see which device's LED blinks. Write down the mapping,
+# then run rename-outlets.sh with that mapping.
+#
+# Usage:
+#   bash dcinfra/powerman/identify-outlets.sh
+#
+# On Friday: run this, walk the rack, note which outlet → which device.
+set -uo pipefail
+PROX_HOST="${PROX_HOST:-pfv-tsys1}"
+REMOTE_SH="$(cd "$(dirname "$0")/../.." && pwd)/tests/remote.sh"
+
+echo "PDU Outlet Identification — Flash Sequence"
+echo "============================================"
+echo "Each outlet will flash for 5 seconds. Walk the rack and note the device."
+echo "Press Enter to start..."
+read -r
+
+for i in $(seq 1 10); do
+  echo "--- Outlet $i: FLASHING (5s) ---"
+  PROX_HOST="$PROX_HOST" bash "$REMOTE_SH" prox "powerman -f outlet-$i" </dev/null 2>/dev/null
+  sleep 5
+  PROX_HOST="$PROX_HOST" bash "$REMOTE_SH" prox "powerman -u outlet-$i" </dev/null 2>/dev/null
+  echo "    Outlet $i → ? (write it down)"
+  echo ""
+  [ "$i" -lt 10 ] && { echo "Press Enter for next outlet..."; read -r; }
+done
+
+echo "============================================"
+echo "Done. Now create your mapping file and run:"
+echo "  bash dcinfra/powerman/rename-outlets.sh"
+echo ""
+echo "Format: outlet-number:new-name (one per line)"
+echo "Example:"
+echo "  1:pfv-tsys1"
+echo "  2:pfv-tsys3"
+echo "  ..."
+echo "============================================"