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_current.go

@@ -100,7 +100,7 @@ The output shows all steps with status indicators:
 				}
 				fmt.Println(".")
 				fmt.Println("\nTo start work on a molecule:")
-				fmt.Println("  bd pour <proto-id>          # Instantiate a molecule from template")
+				fmt.Println("  bd mol pour <proto-id>      # Instantiate a molecule from template")
 				fmt.Println("  bd update <step-id> --status in_progress  # Claim a step")
 				return
 			}