hermes: create ~/.hermes before writing .env on a fresh home

On a first run the key-changed branch writes ~/.hermes/.env before the
installer has created ~/.hermes, so it died with "Directory nonexistent"
and failed bootstrap (seen on a fresh Coder workspace).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

hermes/install.sh

@@ -74,7 +74,9 @@ if [ "$KEY_CHANGED" -eq 1 ] && [ -f "$HOME/.config/mcp-sync/key" ]; then
     fi
     say "hermes: Updated LITELLM_KEY in ~/.hermes/.env"
   else
-    # Create .env if it doesn't exist
+    # Create .env if it doesn't exist. On a fresh home this runs BEFORE the
+    # installer below has created ~/.hermes, so make the directory first.
+    mkdir -p "$HOME/.hermes"
     printf 'LITELLM_KEY=%s\n' "$NEW_KEY" >"$HOME/.hermes/.env"
     say "hermes: Created ~/.hermes/.env with LITELLM_KEY"
   fi