[bin] Add rekey and load_key scripts

bin/.bin/rekey

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+USER="${USER:-$(whoami)}"
+HOST="${HOST:-$(hostname)}"
+DATE="$(date +%F)"
+SSH_DIR="$HOME/.ssh"
+mkdir -p "$SSH_DIR"
+PASS_PATH="personal/ssh/$USER@$HOST/$DATE"
+
+# --- Temporary RAM-backed file for private key ---
+TMP_PRIV="/dev/shm/sshkey_$USER@$HOST$DATE"
+trap 'rm -f "$TMP_PRIV"' EXIT
+
+# Generate Ed25519 key pair into RAM
+ssh-keygen -t ed25519 -f "$TMP_PRIV" -N "" -q
+
+# Insert private key into pass
+cat "$TMP_PRIV" | pass insert --multiline --force "$PASS_PATH"
+echo "Private key stored in pass at $PASS_PATH"
+
+# Extract public key from the same temp file
+ssh-keygen -y -f "$TMP_PRIV" > "$SSH_DIR/$USER@$HOST.pub"
+echo "Public key written to $SSH_DIR/$USER@$HOST.pub"
+
+# Private key removed from /dev/shm automatically