Added some comments to spack.yaml [no-ci]

Author: aidanheerdegen

spack.yaml

@@ -11,9 +11,11 @@ spack:
   specs:
     - access-esm1p6@git.2025.12.001 cice=5
   packages:
+    # Coupler
     oasis3-mct:
       require:
         - '@OASIS3-MCT_5.2'
+    # Major components
     cice5:
       require:
         - '@git.access-esm1.6-2025.11.001=access-esm1.6'
@@ -27,6 +29,8 @@ spack:
     mom5:
       require:
         - '@git.2025.05.000=access-esm1.6'
+    # Model dependencies
+    # MOM5
     access-fms:
       require:
         - '@git.mom5-2025.08.000=mom5'
@@ -36,9 +40,11 @@ spack:
     access-mocsy:
       require:
         - '@2025.07.002'
+    # UM7
     gcom4:
       require:
         - '@git.2025.08.000=access-esm1.5'
+    # Shared dependencies
     openmpi:
       require:
         - '@5.0.8'
@@ -51,6 +57,7 @@ spack:
     hdf5:
       require:
         - '@1.14.3'
+    # System dependencies
     gcc-runtime:
       require:
         - '%gcc'