feat: refresh shared skills catalog

bin/t3-deliver

@@ -1,32 +1,25 @@
 #!/usr/bin/env bash
-# Print a ready-to-paste scp command for pulling a file from this host
-# to the user's Windows machine over Tailscale SSH.
+# Print a command for the user's Windows machine to pull a path over Tailscale SSH.
 set -euo pipefail
-
-HOST="vasily@msi.tail0b014a.ts.net"
-
+DELIVERY_HOST="vasily@msi.tail0b014a.ts.net"
 if [[ $# -ne 1 ]]; then
   echo "usage: t3-deliver <file-or-directory>" >&2
   exit 1
 fi
-
-path="$1"
-if [[ ! -e "$path" ]]; then
-  echo "t3-deliver: no such path: $path" >&2
+if [[ ! -e "$1" ]]; then
+  echo "t3-deliver: no such path: $1" >&2
   exit 1
 fi
-
-if [[ "$path" != /* ]]; then
-  path="$(realpath "$path")"
-else
-  path="$(realpath -m "$path")"
+DELIVERY_PATH="$(realpath -- "$1")"
+# Reject characters that cannot be shared safely between cmd and PowerShell.
+# OpenSSH SFTP mode handles the quoted remote path without a remote shell.
+if [[ "$DELIVERY_PATH" == *[\"\$\`\%\!]* || "$DELIVERY_PATH" == *$'\n'* || "$DELIVERY_PATH" == *$'\r'* ]]; then
+  echo 't3-deliver: rename or archive this path with a simple name before delivery' >&2
+  exit 1
 fi
-
-flags=""
-if [[ -d "$path" ]]; then
-  flags="-r "
+DELIVERY_FLAGS=""
+if [[ -d "$DELIVERY_PATH" ]]; then
+  DELIVERY_FLAGS="-r "
 fi
-
-echo "Paste in cmd or PowerShell on your Windows machine:"
-echo
-echo "${flags}scp ${HOST}:\"${path}\" ."
+printf 'Paste in cmd or PowerShell on your Windows machine (OpenSSH scp with SFTP support):\n\n'
+printf 'scp %s"%s:%s" .\n' "$DELIVERY_FLAGS" "$DELIVERY_HOST" "$DELIVERY_PATH"