Update documentation for bd mol pour/wisp command structure

Updated all documentation and help text to reflect:
- bd pour → bd mol pour
- bd ephemeral → bd mol wisp
- bd ephemeral list → bd mol wisp list
- bd ephemeral gc → bd mol wisp gc

Files updated:
- docs/MOLECULES.md
- docs/CLI_REFERENCE.md
- docs/ARCHITECTURE.md
- docs/DELETIONS.md
- skills/beads/references/MOLECULES.md
- cmd/bd/mol_catalog.go
- cmd/bd/mol_current.go
- cmd/bd/mol_distill.go
- cmd/bd/cook.go

cmd/bd/mol_distill.go

@@ -225,7 +225,7 @@ func runMolDistill(cmd *cobra.Command, args []string) {
 		fmt.Printf("  Variables: %s\n", strings.Join(result.Variables, ", "))
 	}
 	fmt.Printf("\nTo instantiate:\n")
-	fmt.Printf("  bd pour %s", result.FormulaName)
+	fmt.Printf("  bd mol pour %s", result.FormulaName)
 	for _, v := range result.Variables {
 		fmt.Printf(" --var %s=<value>", v)
 	}